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9.8 Critical

CVE-2026-4711 Use-after-free in the Widget: Cocoa component

Description

Use-after-free in the Widget: Cocoa component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 149	earliest → < 149	149
Firefox 140.9	earliest → < 140.9	140.9
Thunderbird 149	earliest → < 149	149
Thunderbird 140.9	earliest → < 140.9	140.9

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 March 24, 2026
Last modified April 13, 2026

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