CVE-2026-2776

Published: Feb 24, 2026Modified: Apr 13, 2026

10.0

Vector

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

Exploitability: 3.9 / Impact: 6.0

Source: NVD

Description

Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

Affected (5)

Products: Mozilla: Firefox, Thunderbird

2 products

Configuration A

5 vulnerable

Vulnerable Software	Affected Versions
Mozilla Firefox	Before 148.0
Mozilla Firefox	Before 115.33.0
Mozilla Firefox	From 128.0 to 140.8.0
Mozilla Thunderbird	Before 148.0
Mozilla Thunderbird	Before 140.8.0

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=2015266

Source: security@mozilla.org

Issue TrackingPermissions Required

https://www.mozilla.org/security/advisories/mfsa2026-13/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-14/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-15/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-16/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-17/

Source: security@mozilla.org

Vendor Advisory

Timeline

No history available yet.