fr Sign in

9.1 Critical

CVE-2026-74938 Mitigation bypass in the JavaScript: GC component

Description

Mitigation bypass in the JavaScript: GC component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 154	earliest → < 154	154
Firefox 153.1	earliest → < 153.1	153.1
Thunderbird 154	earliest → < 154	154
Thunderbird 153.1	earliest → < 153.1	153.1

References

bugzilla.mozilla.org bugzilla.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org

Timeline

Published August 18, 2026
Last modified August 18, 2026

The 2221 CVEs of Firefox →

CVE-2026-120572 Incorrect boundary conditions in the Layout: Block and Inline component 8.8 High CVE-2026-118027 Frame poisoning in the Layout component 9.1 Critical CVE-2026-118024 Use-after-free in the Graphics: Text component 8.8 High CVE-2026-118025 Other issue in the SVG component 8.8 High

Track this CVE