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9.8 Critical

CVE-2025-14321 Use-after-free in the WebRTC: Signaling component

Description

Use-after-free in the WebRTC: Signaling component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 146	earliest → < 146	146
Firefox 140.6	earliest → < 140.6	140.6
Firefox ESR 140.6	earliest → < 140.6	140.6
Thunderbird 146	earliest → < 146	146
Thunderbird 140.6	earliest → < 140.6	140.6

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 December 9, 2025
Last modified April 13, 2026

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