CVE-2026-0879

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.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=2004602	Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-01/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-02/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-03/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-04/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-05/	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:mozilla:firefox:::::esr:::*
	cpe:2.3:a:mozilla:firefox:::::-:::*
	cpe:2.3:a:mozilla:firefox:::::esr:::*
	cpe:2.3:a:mozilla:thunderbird:::::esr:::*
	cpe:2.3:a:mozilla:thunderbird:::::-:::*

History

13 Apr 2026, 15:17

Type	Values Removed	Values Added
Summary		(es) Escape de sandbox debido a condiciones de contorno incorrectas en el componente de Gráficos. Esta vulnerabilidad afecta a Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, y Thunderbird < 140.7.
Summary	(en) Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.	(en) 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.

22 Jan 2026, 18:43

Type	Values Removed	Values Added
First Time		Mozilla Mozilla firefox Mozilla thunderbird
CPE		cpe:2.3:a:mozilla:firefox:::::-:::* cpe:2.3:a:mozilla:thunderbird:::::-:::* cpe:2.3:a:mozilla:thunderbird:::::esr:::* cpe:2.3:a:mozilla:firefox:::::esr:::*
References	~~() https://bugzilla.mozilla.org/show_bug.cgi?id=2004602 -~~	() https://bugzilla.mozilla.org/show_bug.cgi?id=2004602 - Permissions Required
References	~~() https://www.mozilla.org/security/advisories/mfsa2026-01/ -~~	() https://www.mozilla.org/security/advisories/mfsa2026-01/ - Vendor Advisory
References	~~() https://www.mozilla.org/security/advisories/mfsa2026-02/ -~~	() https://www.mozilla.org/security/advisories/mfsa2026-02/ - Vendor Advisory
References	~~() https://www.mozilla.org/security/advisories/mfsa2026-03/ -~~	() https://www.mozilla.org/security/advisories/mfsa2026-03/ - Vendor Advisory
References	~~() https://www.mozilla.org/security/advisories/mfsa2026-04/ -~~	() https://www.mozilla.org/security/advisories/mfsa2026-04/ - Vendor Advisory
References	~~() https://www.mozilla.org/security/advisories/mfsa2026-05/ -~~	() https://www.mozilla.org/security/advisories/mfsa2026-05/ - Vendor Advisory

15 Jan 2026, 10:16

Type	Values Removed	Values Added
Summary	~~(en) Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, and Firefox ESR < 140.7.~~	(en) Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.
References		() https://www.mozilla.org/security/advisories/mfsa2026-04/ - () https://www.mozilla.org/security/advisories/mfsa2026-05/ -

13 Jan 2026, 19:16

Type	Values Removed	Values Added
CWE		CWE-119
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.8

13 Jan 2026, 14:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-01-13 14:16

Updated : 2026-04-13 15:17

NVD link : CVE-2026-0879

Mitre link : CVE-2026-0879

CVE.ORG link : CVE-2026-0879

JSON object : View

Products Affected

mozilla

firefox
thunderbird

CWE

CWE-119

Improper Restriction of Operations within the Bounds of a Memory Buffer

9.8 /10