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CVE-2026-4691

Use-after-free in the CSS Parsing and Computation component PUBLISHED

Description (CNA)

Use-after-free in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Affected (CNA)

Vendor / productVersions
Mozilla / Firefoxunaffected 115.34 through 115.*; unaffected 140.9 through 140.*; unaffected 149 through *
Mozilla / Thunderbirdunaffected 140.9 through 140.*; unaffected 149 through *

CWE

No CWE identifiers supplied.

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

redhat-SADP

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the CSS Parsing and Computation component