CVE-2026-0892

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-0892
Memory safety bugs present in Firefox 146 and Thunderbird 146. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 147 and Thunderbird < 147.

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/buglist.cgi?bug_id=1986912%2C1996718%2C1999633%2C2001081%2C2004443 Broken Link
https://www.mozilla.org/security/advisories/mfsa2026-01/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-04/ Vendor Advisory
Configurations

Configuration 1 (hide)

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

22 Jan 2026, 19:14

Type Values Removed Values Added
References () https://bugzilla.mozilla.org/buglist.cgi?bug_id=1986912%2C1996718%2C1999633%2C2001081%2C2004443 - () https://bugzilla.mozilla.org/buglist.cgi?bug_id=1986912%2C1996718%2C1999633%2C2001081%2C2004443 - Broken Link
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/mfsa2026-04/ - () https://www.mozilla.org/security/advisories/mfsa2026-04/ - Vendor Advisory
First Time Mozilla
Mozilla firefox
Mozilla thunderbird
CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*

15 Jan 2026, 10:16

Type Values Removed Values Added
References
  • () https://www.mozilla.org/security/advisories/mfsa2026-04/ -
Summary (en) Memory safety bugs present in Firefox 146 and Thunderbird 146. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 147. (en) Memory safety bugs present in Firefox 146 and Thunderbird 146. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 147 and Thunderbird < 147.

13 Jan 2026, 15:16

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 : 2026-01-22 19:14

NVD link : CVE-2026-0892

Mitre link : CVE-2026-0892

CVE.ORG link : CVE-2026-0892

JSON object : View

Products Affected

mozilla

  • thunderbird
  • firefox
CWE
CWE-119

Improper Restriction of Operations within the Bounds of a Memory Buffer