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9.1 Critical

CVE-2026-16392 JIT miscompilation in the JavaScript Engine: JIT component

Description

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 153	earliest → < 153	153
Thunderbird 153	earliest → < 153	153

References

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

Timeline

Published July 21, 2026
Last modified July 28, 2026

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