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9.6 Critical

CVE-2026-109755 Sandbox escape in the DOM: Content Processes component

Description

Sandbox escape in the DOM: Content Processes component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 158	earliest → < 158	158
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 13, 2026
Last modified October 15, 2026

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