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9.1 Critical

CVE-2026-16406 Mitigation bypass in the Networking component

Description

Mitigation bypass in the Networking 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 22, 2026

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