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9.8 Critical

CVE-2026-106016 Mitigation bypass in the File Handling component

Description

Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 157.0.1 and Thunderbird 158.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 157.0	earliest → < 157.0.1	157.0.1
Thunderbird 158	earliest → < 158	158

References

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

Timeline

Published October 6, 2026
Last modified October 13, 2026

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