fr Sign in

6.5 Medium

CVE-2025-9181 Uninitialized memory in the JavaScript Engine component

Description

Uninitialized memory in the JavaScript Engine component. This vulnerability was fixed in Firefox 142, Firefox ESR 128.14, Firefox ESR 140.2, Thunderbird 142, Thunderbird 128.14, and Thunderbird 140.2.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 142	earliest → < 142	142
Firefox 140.2	earliest → < 140.2	140.2
Firefox 128.14	earliest → < 128.14	128.14
Firefox ESR 140.2	earliest → < 140.2	140.2
Thunderbird 142	earliest → < 142	142
Thunderbird 140.2	earliest → < 140.2	140.2
Thunderbird 128.14	earliest → < 128.14	128.14

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

Timeline

Published August 19, 2025
Last modified April 13, 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-2026-118025 Other issue in the SVG component 8.8 High CVE-2026-118026 Invalid pointer in the JavaScript: GC component 8.8 High

Track this CVE