8.8 High

CVE-2026-118019 Race condition, use-after-free in the DOM: File component

Description

Race condition, use-after-free in the DOM: File component. This vulnerability was fixed in Firefox 159 and Thunderbird 159.

CVSS 3.1 detail

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitable remotely over the network, without an account and if a user takes an action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector: Network
Attack complexity: Low
Privileges required: None
Interaction: Required
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Affected products and versions

Product	Affected versions	Fixed in
Firefox 159	earliest → < 159	159
Thunderbird 159	earliest → < 159	159

References

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

Timeline

Published October 27, 2026
Last modified November 5, 2026

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