CVE-2026-2786

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

Vendor	Product	Versions
Mozilla	Firefox	—
Mozilla	Thunderbird	—

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2013612Issue Tracking, Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-13/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-15/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-16/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-17/Vendor Advisory

Timeline

Published: Feb 24, 2026
Last modified: Jun 17, 2026
NVD status: Modified

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