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9.8 Critical

CVE-2026-0884 Use-after-free in the JavaScript Engine component

Description

Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 147	earliest → < 147	147
Firefox 140.7	earliest → < 140.7	140.7
Firefox ESR 140.7	earliest → < 140.7	140.7
Thunderbird 147	earliest → < 147	147
Thunderbird 140.7	earliest → < 140.7	140.7

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 January 13, 2026
Last modified April 13, 2026

The 2221 CVEs of Firefox →

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