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Vulnerability · Published Oct 27, 2026 · Assigned by mozilla

CVE-2026-118004Incorrect boundary conditions in the CSS Transitions and Animations component

High 8.1

In plain English

A high-severity memory corruption in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.4%top 69.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Incorrect boundary conditions in the CSS Transitions and Animations component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12firefox-esr153.6.0esr-1~deb12u2DEBIAN-CVE-2026-118004
Debian:13firefox-esr153.6.0esr-1~deb13u1DEBIAN-CVE-2026-118004
Debian:14firefox-esrno fix listedDEBIAN-CVE-2026-118004
Debian:12thunderbird1:153.6.0esr-1~deb12u2DEBIAN-CVE-2026-118004
Debian:13thunderbird1:153.6.0esr-1~deb13u1DEBIAN-CVE-2026-118004
Debian:14thunderbirdno fix listedDEBIAN-CVE-2026-118004
Ubuntu:22.04:LTSmozjs102no fix listedUBUNTU-CVE-2026-118004
Ubuntu:24.04:LTSmozjs102no fix listedUBUNTU-CVE-2026-118004
Ubuntu:24.04:LTSmozjs115no fix listedUBUNTU-CVE-2026-118004
Ubuntu:22.04:LTSmozjs78no fix listedUBUNTU-CVE-2026-118004
Ubuntu:22.04:LTSmozjs91no fix listedUBUNTU-CVE-2026-118004
Ubuntu:22.04:LTSthunderbirdno fix listedUBUNTU-CVE-2026-118004

Affected products (as reported)

VendorProductVersions
Mozilla Firefox see references
Mozilla Thunderbird see references

Weakness: CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

References