CVE-2026-0879

Published: Jan 13, 2026Modified: Apr 13, 2026

9.8

Vector

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

Exploitability: 3.9 / Impact: 5.9

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

Affected (5)

Products: Mozilla: Firefox, Thunderbird

2 products

Configuration A

5 vulnerable

Vulnerable Software	Affected Versions
Mozilla Firefox	Before 147.0
Mozilla Firefox	Before 115.32.0
Mozilla Firefox	From 128.0 to 140.7.0
Mozilla Thunderbird	Before 147.0
Mozilla Thunderbird	Before 140.7.0

Related CWEs

Improper Restriction of Operations within the Bounds of a Memory Buffer

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

References (6)

https://bugzilla.mozilla.org/show_bug.cgi?id=2004602

Source: security@mozilla.org

Permissions Required

https://www.mozilla.org/security/advisories/mfsa2026-01/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-02/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-03/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-04/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-05/

Source: security@mozilla.org

Vendor Advisory

Timeline

No history available yet.