CVE & CISA-KEV Catalog

CVE-2026-42504

HIGH
7.5
CVSS v3
NVD

Description

Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.

How to fix

Remediation Available
stdlibGo
Fixed in:1.26.4GO-2026-5038
butaneRed Hat / RHEL
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
butaneRocky
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
butane-debuginfoRocky
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
butane-debuginfoRed Hat / RHEL
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
butane-debugsourceRed Hat / RHEL
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
butane-debugsourceRocky
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
butane-redistributableRocky
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
butane-redistributableRed Hat / RHEL
Fixed in:0:0.26.0-3.rhaos4.21.el8RHSA-2026:57456
Fixed in:0:0.23.0-5.rhaos4.18.el8RHSA-2026:57482
containernetworking-pluginsRocky
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
containernetworking-pluginsRed Hat / RHEL
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
containernetworking-plugins-debuginfoRocky
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
containernetworking-plugins-debuginfoRed Hat / RHEL
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
containernetworking-plugins-debugsourceRocky
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
containernetworking-plugins-debugsourceRed Hat / RHEL
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.17.el8RHSA-2026:60018
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
Fixed in:1:1.4.0-10.rhaos4.18.el8RHSA-2026:57482
cri-oRed Hat / RHEL
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
cri-oRocky
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
cri-o-debuginfoRocky
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
cri-o-debuginfoRed Hat / RHEL
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
cri-o-debugsourceRocky
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
cri-o-debugsourceRed Hat / RHEL
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.31.13-12.rhaos4.18.git249255c.el8RHSA-2026:57482
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
Fixed in:0:1.30.14-11.rhaos4.17.git1e2a16d.el8RHSA-2026:60018
cri-toolsRocky
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
cri-toolsRed Hat / RHEL
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
cri-tools-debuginfoRed Hat / RHEL
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
cri-tools-debuginfoRocky
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
cri-tools-debugsourceRed Hat / RHEL
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
cri-tools-debugsourceRocky
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.30.0-9.el8RHSA-2026:60018
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
Fixed in:0:1.31.1-7.el8RHSA-2026:57482
cryostat/cryostatRed Hat / RHEL
Fixed in:db-rhel9@sha256:1dadbcd03e36720ff1bccd2fa77cdb7096e94322794f5ad3b8a511d08c0c30d3_amd64RHSA-2026:48151
Fixed in:rhel9@sha256:cb6b42fb943940abf1e5c7c9f6050a7f950066497c89dd1306051697d7d207a6_arm64RHSA-2026:48151
Fixed in:rhel9-operator@sha256:bd3419415c6e31e2c5269b371d8097e69cad1ff84cea5b98b4892ffad05a501f_arm64RHSA-2026:48151
Fixed in:operator-bundle@sha256:8aba4092e4ca595ee8df8f878754f698059c72d956022a1fe9e123d6ed7a7fa6_amd64RHSA-2026:48151
Fixed in:reports-rhel9@sha256:b34a578607642a41719d12a902df7b4549606f37e773f6b20ed047b94c1739fe_amd64RHSA-2026:48151
Fixed in:db-rhel9@sha256:c1d344fddcfb7ff4ca4bc3a2ba88917c918879b8411aef0dc1c252e151e7df5f_arm64RHSA-2026:48151
Fixed in:operator-bundle@sha256:f6f18f4a84f0a0381e5d03893d2968050537f7e20b08b61b54e922c4d9359292_arm64RHSA-2026:48151
Fixed in:reports-rhel9@sha256:a93361b346844f7ec4108a9658cb5fdd61c8963e90ee15e52fb213b1bb4d01c6_arm64RHSA-2026:48151
cryostat/cryostatRocky
Fixed in:reports-rhel9@sha256:b34a578607642a41719d12a902df7b4549606f37e773f6b20ed047b94c1739fe_amd64RHSA-2026:48151
Fixed in:storage-rhel9@sha256:51b54fe0f6d011cd59eaa810f62d4d8b8dde5c0ebd75684cbc2eac104466c467_amd64RHSA-2026:48151
Fixed in:rhel9@sha256:cb6b42fb943940abf1e5c7c9f6050a7f950066497c89dd1306051697d7d207a6_arm64RHSA-2026:48151
Fixed in:db-rhel9@sha256:c1d344fddcfb7ff4ca4bc3a2ba88917c918879b8411aef0dc1c252e151e7df5f_arm64RHSA-2026:48151
Fixed in:rhel9-operator@sha256:bd3419415c6e31e2c5269b371d8097e69cad1ff84cea5b98b4892ffad05a501f_arm64RHSA-2026:48151
Fixed in:storage-rhel9@sha256:a6ab21c3097a8268cba87c6eeb1f512454da0c68410031c4160c7d7378920850_arm64RHSA-2026:48151
Fixed in:rhel9-operator@sha256:98849e3734fbdeb2252a6d4863f999ebba93155c5c650e42711c76c82b6c6b45_amd64RHSA-2026:48151
Fixed in:rhel9@sha256:c0b028b465d8e6f3b262659195c01deee13538c1e34a823bffb7624bbb5252fc_amd64RHSA-2026:48151
cryostat/cryostat-agentRed Hat / RHEL
Fixed in:init-rhel9@sha256:a9a7a4aff8961cea3f5a4cd5b3370c5f13105e9461f4fb0de70bcfa7b5facab1_arm64RHSA-2026:48151
Fixed in:init-rhel9@sha256:56a21c05b7e6face6abbb05a1165d02640779cda3dc829e21237840e7cbac579_amd64RHSA-2026:48151

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

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

ConfidentialityNone
IntegrityNone
AvailabilityHigh

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

Exploit Intelligence

0.56%probability of exploitation in 30 days
45thpercentile

Moderate risk: more likely to be exploited than 45% of all known CVEs.

References

Related Vulnerabilities

Other CWE-407 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2020-27223Medium5.278%-Fix
CVE-2022-36021Medium5.561%-Fix
CVE-2021-33582High7.53.1%-Fix
CVE-2024-43485High7.53.1%-Fix
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Common questions

How do I fix CVE-2026-42504?

Published advisories record a fix for 397 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-2026-42504 being actively exploited?

Not that we know of. CVE-2026-42504 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.56% is the estimated probability that it will be exploited in the next 30 days. That is higher than 45% of all scored CVEs.

How severe is CVE-2026-42504?

CVE-2026-42504 has a CVSS v3 base score of 7.5, rated important. 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-2026-42504 affect?

Published advisories record a fix for stdlib (Go), butane (Red Hat / RHEL), butane (Rocky), butane-debuginfo (Rocky), and 393 more. The list on this page is capped, so there may be more.

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CVE-2026-42504 severity badge

Markdown

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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 2026-07-22.