CVE-2026-12291

HIGH

8.8

CVSS v3

Description

Use-after-free in the Networking: HTTP component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

CWE-416Use After Free CWE-825

How to fix

Remediation Available

firefoxDebian

Fixed in:152.0-1CVE-2026-12291

firefoxRocky

Fixed in:0:140.12.0-1.el10_0RHSA-2026:36100

Fixed in:0:140.12.0-1.el10_2RHSA-2026:27733

Fixed in:0:140.12.0-1.el10_0RHSA-2026:36100

Fixed in:0:140.12.0-1.el10_2RHSA-2026:27733

Fixed in:0:140.12.0-1.el7_9RHSA-2026:38506

Fixed in:0:140.12.0-1.el7_9.ppc64RHSA-2026:38506

Fixed in:0:140.12.0-1.el7_9RHSA-2026:38506

Fixed in:0:140.12.0-1.el8_6RHSA-2026:37210

Fixed in:0:140.12.0-1.el8_8RHSA-2026:36103

Fixed in:0:140.12.0-1.el8_6RHSA-2026:37210

Fixed in:0:140.12.0-1.el8_4RHSA-2026:36102

Fixed in:0:140.12.0-1.el8_8RHSA-2026:36103

Fixed in:0:140.12.0-1.el8_10RHSA-2026:27717

Fixed in:0:140.12.0-1.el8_8RHSA-2026:36103

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

firefoxRed Hat / RHEL

Fixed in:0:140.12.0-1.el10_0RHSA-2026:36100

Fixed in:0:140.12.0-1.el10_2RHSA-2026:27733

Fixed in:0:140.12.0-1.el10_0RHSA-2026:36100

Fixed in:0:140.12.0-1.el7_9RHSA-2026:38506

Fixed in:0:140.12.0-1.el7_9.ppc64RHSA-2026:38506

Fixed in:0:140.12.0-1.el8_8RHSA-2026:36103

Fixed in:0:140.12.0-1.el8_6RHSA-2026:37210

Fixed in:0:140.12.0-1.el8_4RHSA-2026:36102

Fixed in:0:140.12.0-1.el8_8RHSA-2026:36103

Fixed in:0:140.12.0-1.el8_6RHSA-2026:37210

Fixed in:0:140.12.0-1.el8_4RHSA-2026:36102

Fixed in:0:140.12.0-1.el8_10RHSA-2026:27717

Fixed in:0:140.12.0-1.el8_8RHSA-2026:36103

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

firefox-debuginfoRed Hat / RHEL

Fixed in:0:140.12.0-1.el10_0RHSA-2026:36100

Fixed in:0:140.12.0-1.el10_2RHSA-2026:27733

Fixed in:0:140.12.0-1.el7_9.ppc64RHSA-2026:38506

Fixed in:0:140.12.0-1.el7_9RHSA-2026:38506

Fixed in:0:140.12.0-1.el8_10RHSA-2026:27717

Fixed in:0:140.12.0-1.el8_4RHSA-2026:36102

Fixed in:0:140.12.0-1.el8_6RHSA-2026:37210

Fixed in:0:140.12.0-1.el8_10RHSA-2026:27717

Fixed in:0:140.12.0-1.el8_8RHSA-2026:36103

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

firefox-debuginfoRocky

Fixed in:0:140.12.0-1.el10_2RHSA-2026:27733

Fixed in:0:140.12.0-1.el10_0RHSA-2026:36100

Fixed in:0:140.12.0-1.el10_2RHSA-2026:27733

Fixed in:0:140.12.0-1.el10_0RHSA-2026:36100

Fixed in:0:140.12.0-1.el7_9RHSA-2026:38506

Fixed in:0:140.12.0-1.el7_9.ppc64RHSA-2026:38506

Fixed in:0:140.12.0-1.el8_4RHSA-2026:36102

Fixed in:0:140.12.0-1.el8_10RHSA-2026:27717

Fixed in:0:140.12.0-1.el8_6RHSA-2026:37210

Fixed in:0:140.12.0-1.el8_10RHSA-2026:27717

Fixed in:0:140.12.0-1.el8_8RHSA-2026:36103

Fixed in:0:140.12.0-1.el8_10RHSA-2026:27717

Fixed in:0:140.12.0-1.el8_8RHSA-2026:36103

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

firefox-debugsourceRed Hat / RHEL

Fixed in:0:140.12.0-1.el10_2RHSA-2026:27733

Fixed in:0:140.12.0-1.el10_0RHSA-2026:36100

Fixed in:0:140.12.0-1.el10_2RHSA-2026:27733

Fixed in:0:140.12.0-1.el10_0RHSA-2026:36100

Fixed in:0:140.12.0-1.el10_2RHSA-2026:27733

Fixed in:0:140.12.0-1.el8_10RHSA-2026:27717

Fixed in:0:140.12.0-1.el8_8RHSA-2026:36103

Fixed in:0:140.12.0-1.el8_4RHSA-2026:36102

Fixed in:0:140.12.0-1.el8_6RHSA-2026:37210

Fixed in:0:140.12.0-1.el8_8RHSA-2026:36103

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

firefox-debugsourceRocky

Fixed in:0:140.12.0-1.el10_2RHSA-2026:27733

Fixed in:0:140.12.0-1.el10_0RHSA-2026:36100

Fixed in:0:140.12.0-1.el10_2RHSA-2026:27733

Fixed in:0:140.12.0-1.el10_0RHSA-2026:36100

Fixed in:0:140.12.0-1.el10_2RHSA-2026:27733

Fixed in:0:140.12.0-1.el10_0RHSA-2026:36100

Fixed in:0:140.12.0-1.el8_10RHSA-2026:27717

Fixed in:0:140.12.0-1.el8_4RHSA-2026:36102

Fixed in:0:140.12.0-1.el8_6RHSA-2026:37210

Fixed in:0:140.12.0-1.el8_8RHSA-2026:36103

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

firefox-x11Rocky

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

firefox-x11Red Hat / RHEL

Fixed in:0:140.12.0-1.el9_8RHSA-2026:27734

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_6RHSA-2026:37391

Fixed in:0:140.12.0-1.el9_2RHSA-2026:36101

Fixed in:0:140.12.0-1.el9_4RHSA-2026:39011

thunderbirdRed Hat / RHEL

Fixed in:0:140.12.0-1.el10_0RHSA-2026:38751

Fixed in:0:140.12.0-1.el10_2RHSA-2026:30846

Fixed in:0:140.12.0-1.el10_0RHSA-2026:38751

Fixed in:0:140.12.0-1.el10_2RHSA-2026:30846

Fixed in:0:140.12.0-1.el10_0RHSA-2026:38751

Fixed in:0:140.12.0-1.el10_2RHSA-2026:30846

Fixed in:0:140.12.0-1.el8_6RHSA-2026:39141

Fixed in:0:140.12.0-1.el8_10RHSA-2026:33445

Fixed in:0:140.12.0-1.el8_8RHSA-2026:39142

Fixed in:0:140.12.0-1.el8_10RHSA-2026:33445

Fixed in:0:140.12.0-1.el8_8RHSA-2026:39142

Fixed in:0:140.12.0-1.el8_10RHSA-2026:33445

Fixed in:0:140.12.0-1.el8_4RHSA-2026:39428

Fixed in:0:140.12.0-1.el8_6RHSA-2026:39141

Fixed in:0:140.12.0-1.el8_4RHSA-2026:39428

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_2RHSA-2026:39706

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_2RHSA-2026:39706

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

thunderbirdRocky

Fixed in:0:140.12.0-1.el10_0RHSA-2026:38751

Fixed in:0:140.12.0-1.el10_2RHSA-2026:30846

Fixed in:0:140.12.0-1.el10_0RHSA-2026:38751

Fixed in:0:140.12.0-1.el10_2RHSA-2026:30846

Fixed in:0:140.12.0-1.el10_0RHSA-2026:38751

Fixed in:0:140.12.0-1.el10_2RHSA-2026:30846

Fixed in:0:140.12.0-1.el8_10RHSA-2026:33445

Fixed in:0:140.12.0-1.el8_8RHSA-2026:39142

Fixed in:0:140.12.0-1.el8_6RHSA-2026:39141

Fixed in:0:140.12.0-1.el8_4RHSA-2026:39428

Fixed in:0:140.12.0-1.el8_10RHSA-2026:33445

Fixed in:0:140.12.0-1.el8_6RHSA-2026:39141

Fixed in:0:140.12.0-1.el8_8RHSA-2026:39142

Fixed in:0:140.12.0-1.el8_4RHSA-2026:39428

Fixed in:0:140.12.0-1.el8_10RHSA-2026:33445

Fixed in:0:140.12.0-1.el8_8RHSA-2026:39142

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_2RHSA-2026:39706

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_2RHSA-2026:39706

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_2RHSA-2026:39706

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

thunderbird-debuginfoRed Hat / RHEL

Fixed in:0:140.12.0-1.el10_0RHSA-2026:38751

Fixed in:0:140.12.0-1.el10_2RHSA-2026:30846

Fixed in:0:140.12.0-1.el10_0RHSA-2026:38751

Fixed in:0:140.12.0-1.el10_2RHSA-2026:30846

Fixed in:0:140.12.0-1.el8_6RHSA-2026:39141

Fixed in:0:140.12.0-1.el8_10RHSA-2026:33445

Fixed in:0:140.12.0-1.el8_8RHSA-2026:39142

Fixed in:0:140.12.0-1.el8_10RHSA-2026:33445

Fixed in:0:140.12.0-1.el8_4RHSA-2026:39428

Fixed in:0:140.12.0-1.el8_10RHSA-2026:33445

Fixed in:0:140.12.0-1.el8_8RHSA-2026:39142

Fixed in:0:140.12.0-1.el8_10RHSA-2026:33445

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_2RHSA-2026:39706

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_2RHSA-2026:39706

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_2RHSA-2026:39706

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

thunderbird-debuginfoRocky

Fixed in:0:140.12.0-1.el10_0RHSA-2026:38751

Fixed in:0:140.12.0-1.el10_2RHSA-2026:30846

Fixed in:0:140.12.0-1.el10_0RHSA-2026:38751

Fixed in:0:140.12.0-1.el10_2RHSA-2026:30846

Fixed in:0:140.12.0-1.el10_0RHSA-2026:38751

Fixed in:0:140.12.0-1.el10_2RHSA-2026:30846

Fixed in:0:140.12.0-1.el8_6RHSA-2026:39141

Fixed in:0:140.12.0-1.el8_10RHSA-2026:33445

Fixed in:0:140.12.0-1.el8_4RHSA-2026:39428

Fixed in:0:140.12.0-1.el8_8RHSA-2026:39142

Fixed in:0:140.12.0-1.el8_10RHSA-2026:33445

Fixed in:0:140.12.0-1.el8_8RHSA-2026:39142

Fixed in:0:140.12.0-1.el9_2RHSA-2026:39706

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_2RHSA-2026:39706

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_2RHSA-2026:39706

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

thunderbird-debugsourceRocky

Fixed in:0:140.12.0-1.el10_0RHSA-2026:38751

Fixed in:0:140.12.0-1.el10_2RHSA-2026:30846

Fixed in:0:140.12.0-1.el10_0RHSA-2026:38751

Fixed in:0:140.12.0-1.el10_2RHSA-2026:30846

Fixed in:0:140.12.0-1.el10_0RHSA-2026:38751

Fixed in:0:140.12.0-1.el10_2RHSA-2026:30846

Fixed in:0:140.12.0-1.el10_0RHSA-2026:38751

Fixed in:0:140.12.0-1.el8_10RHSA-2026:33445

Fixed in:0:140.12.0-1.el8_6RHSA-2026:39141

Fixed in:0:140.12.0-1.el8_8RHSA-2026:39142

Fixed in:0:140.12.0-1.el8_10RHSA-2026:33445

Fixed in:0:140.12.0-1.el8_4RHSA-2026:39428

Fixed in:0:140.12.0-1.el8_10RHSA-2026:33445

Fixed in:0:140.12.0-1.el9_2RHSA-2026:39706

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_2RHSA-2026:39706

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

thunderbird-debugsourceRed Hat / RHEL

Fixed in:0:140.12.0-1.el10_2RHSA-2026:30846

Fixed in:0:140.12.0-1.el10_0RHSA-2026:38751

Fixed in:0:140.12.0-1.el10_2RHSA-2026:30846

Fixed in:0:140.12.0-1.el10_0RHSA-2026:38751

Fixed in:0:140.12.0-1.el10_2RHSA-2026:30846

Fixed in:0:140.12.0-1.el8_10RHSA-2026:33445

Fixed in:0:140.12.0-1.el8_4RHSA-2026:39428

Fixed in:0:140.12.0-1.el8_6RHSA-2026:39141

Fixed in:0:140.12.0-1.el8_8RHSA-2026:39142

Fixed in:0:140.12.0-1.el8_10RHSA-2026:33445

Fixed in:0:140.12.0-1.el8_8RHSA-2026:39142

Fixed in:0:140.12.0-1.el9_2RHSA-2026:39706

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_2RHSA-2026:39706

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

Fixed in:0:140.12.0-1.el9_2RHSA-2026:39706

Fixed in:0:140.12.0-1.el9_8RHSA-2026:29940

Fixed in:0:140.12.0-1.el9_4RHSA-2026:38753

Fixed in:0:140.12.0-1.el9_6RHSA-2026:38750

DeveloperEditionWindows application

Affected:115.37.0Fixed in:115.37.0Mozilla

Affected:152.0.0Fixed in:152.0.0Mozilla

Affected:128.0 140.12.0Fixed in:140.12.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:115.37.0Fixed in:115.37.0Mozilla

Affected:152.0.0Fixed in:152.0.0Mozilla

Affected:128.0 140.12.0Fixed in:140.12.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:152.0.0Fixed in:152.0.0Mozilla

Affected:140.12.0Fixed in:140.12.0Mozilla

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 InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploit Intelligence

0.38%probability of exploitation in 30 days

31stpercentile

Low risk: more likely to be exploited than 31% of all known CVEs.

References

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	96%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2021-34833	High	7.8	96%	-	-

Common questions

How do I fix CVE-2026-12291?

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-2026-12291 being actively exploited?

Not that we know of. CVE-2026-12291 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.38% is the estimated probability that it will be exploited in the next 30 days. That is higher than 31% of all scored CVEs.

How severe is CVE-2026-12291?

CVE-2026-12291 has a CVSS v3 base score of 8.8, rated high. 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-2026-12291 affect?

Published advisories record a fix for firefox (Debian), firefox (Rocky), firefox (Red Hat / RHEL), firefox-debuginfo (Red Hat / RHEL), 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-2026-12291

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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.