CVE & CISA-KEV CatalogNVD
CVE-2026-4721
CRITICAL9.8
CVSS v3
Description
Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
How to fix
Remediation Available
firefoxDebian
Fixed in:149.0-1CVE-2026-4721
firefoxRocky
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el7_9RHSA-2026:8427
Fixed in:0:140.9.0-1.el7_9RHSA-2026:8427
Fixed in:0:140.9.0-1.el7_9.ppc64RHSA-2026:8427
Fixed in:0:140.9.0-1.el7_9RHSA-2026:8427
Fixed in:0:140.9.0-1.el7_9RHSA-2026:8427
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_8RHSA-2026:7838
Fixed in:0:140.9.0-1.el8_8RHSA-2026:7838
Fixed in:0:140.9.0-1.el8_8RHSA-2026:7838
Fixed in:0:140.9.0-1.el8_2RHSA-2026:7840
Fixed in:0:140.9.0-1.el8_4RHSA-2026:7858
Fixed in:0:140.9.0-1.el8_4RHSA-2026:7858
Fixed in:0:140.9.0-1.el8_2RHSA-2026:7840
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
firefoxRed Hat / RHEL
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el7_9RHSA-2026:8427
Fixed in:0:140.9.0-1.el7_9RHSA-2026:8427
Fixed in:0:140.9.0-1.el7_9RHSA-2026:8427
Fixed in:0:140.9.0-1.el7_9RHSA-2026:8427
Fixed in:0:140.9.0-1.el7_9.ppc64RHSA-2026:8427
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_8RHSA-2026:7838
Fixed in:0:140.9.0-1.el8_8RHSA-2026:7838
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_4RHSA-2026:7858
Fixed in:0:140.9.0-1.el8_4RHSA-2026:7858
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_2RHSA-2026:7840
Fixed in:0:140.9.0-1.el8_2RHSA-2026:7840
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_8RHSA-2026:7838
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
firefox-debuginfoRocky
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el7_9.ppc64RHSA-2026:8427
Fixed in:0:140.9.0-1.el7_9RHSA-2026:8427
Fixed in:0:140.9.0-1.el7_9RHSA-2026:8427
Fixed in:0:140.9.0-1.el8_8RHSA-2026:7838
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_4RHSA-2026:7858
Fixed in:0:140.9.0-1.el8_2RHSA-2026:7840
Fixed in:0:140.9.0-1.el8_8RHSA-2026:7838
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
firefox-debuginfoRed Hat / RHEL
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el7_9RHSA-2026:8427
Fixed in:0:140.9.0-1.el7_9.ppc64RHSA-2026:8427
Fixed in:0:140.9.0-1.el7_9RHSA-2026:8427
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_2RHSA-2026:7840
Fixed in:0:140.9.0-1.el8_4RHSA-2026:7858
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_8RHSA-2026:7838
Fixed in:0:140.9.0-1.el8_8RHSA-2026:7838
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
firefox-debugsourceRed Hat / RHEL
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_4RHSA-2026:7858
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_8RHSA-2026:7838
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_2RHSA-2026:7840
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_8RHSA-2026:7838
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
firefox-debugsourceRocky
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_1RHSA-2026:5931
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el10_0RHSA-2026:7843
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_8RHSA-2026:7838
Fixed in:0:140.9.0-1.el8_2RHSA-2026:7840
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_10RHSA-2026:5932
Fixed in:0:140.9.0-1.el8_4RHSA-2026:7858
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el8_8RHSA-2026:7838
Fixed in:0:140.9.0-1.el8_6RHSA-2026:7842
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_0RHSA-2026:7839
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
firefox-x11Red Hat / RHEL
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
firefox-x11Rocky
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_4RHSA-2026:7845
Fixed in:0:140.9.0-1.el9_6RHSA-2026:7837
Fixed in:0:140.9.0-1.el9_7RHSA-2026:5930
Fixed in:0:140.9.0-1.el9_2RHSA-2026:7841
thunderbirdRed Hat / RHEL
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el8_4RHSA-2026:8850
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_2RHSA-2026:8285
Fixed in:0:140.9.0-1.el8_2RHSA-2026:8285
Fixed in:0:140.9.0-1.el8_4RHSA-2026:8850
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
thunderbirdRocky
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288
Fixed in:0:140.9.0-1.el8_4RHSA-2026:8850
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_4RHSA-2026:8850
Fixed in:0:140.9.0-1.el8_2RHSA-2026:8285
Fixed in:0:140.9.0-1.el8_2RHSA-2026:8285
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
thunderbird-debuginfoRocky
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_4RHSA-2026:8850
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_2RHSA-2026:8285
Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
thunderbird-debuginfoRed Hat / RHEL
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_4RHSA-2026:8850
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_2RHSA-2026:8285
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
thunderbird-debugsourceRed Hat / RHEL
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_4RHSA-2026:8850
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_2RHSA-2026:8285
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
thunderbird-debugsourceRocky
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el10_0RHSA-2026:8315
Fixed in:0:140.9.0-1.el10_1RHSA-2026:6342
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_4RHSA-2026:8850
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_10RHSA-2026:6917
Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288
Fixed in:0:140.9.0-1.el8_8RHSA-2026:8288
Fixed in:0:140.9.0-1.el8_6RHSA-2026:8289
Fixed in:0:140.9.0-1.el8_2RHSA-2026:8285
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_0RHSA-2026:8286
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_4RHSA-2026:8290
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_6RHSA-2026:8284
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_7RHSA-2026:6188
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
Fixed in:0:140.9.0-1.el9_2RHSA-2026:8287
DeveloperEditionWindows application
Mozilla Firefox (en-US)Windows application
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploit Intelligence
0.42%probability of exploitation in 30 days
35thpercentile
Low risk: more likely to be exploited than 35% of all known CVEs.
References
Vendor Advisory5
Other references29
- bugzilla.mozilla.org
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
- access.redhat.com
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Related Vulnerabilities
Other CWE-120 (Classic Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2014-0195 | Medium | 6.8 | 100% | - | Fix |
| CVE-2017-7269 | Critical | 9.8 | 100% | KEV | - |
| CVE-2019-11043 | High | 8.7 | 99% | KEV + Ransom | Fix |
| CVE-2011-4862 | High | 10.0 | 95% | - | Fix |
| CVE-2007-5659 | High | 7.8 | 94% | KEV | Fix |
| CVE-2022-3786 | High | 7.5 | 92% | - | Fix |
Common questions
How do I fix CVE-2026-4721?
Published advisories record a fix for 18 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2026-4721 being actively exploited?
Not that we know of. CVE-2026-4721 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.42% is the estimated probability that it will be exploited in the next 30 days. That is higher than 35% of all scored CVEs.
How severe is CVE-2026-4721?
CVE-2026-4721 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-4721 affect?
Published advisories record a fix for firefox (Debian), firefox (Rocky), firefox (Red Hat / RHEL), firefox-debuginfo (Rocky), and 14 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-4721
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[](https://tridentstack.com/cve/CVE-2026-4721)HTML
<a href="https://tridentstack.com/cve/CVE-2026-4721"><img src="https://tridentstack.com/cve/badge/CVE-2026-4721.svg" alt="CVE-2026-4721"></a>Find and fix vulnerabilities across your fleet
TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.
This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-15.