CVE-2026-0891
CVE-2026-0891
8.1
HighPublished:
Last updated:
Source:security@mozilla.org
Modified
Weakness (CWE)
CVSS Vector
v3.1- Attack Vector
- Network
- Attack Complexity
- High
- Privileges Required
- None
- User Interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Description
Memory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, 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 was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.
References
security@mozilla.org
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1964722%2C2000981%2C2003100%2C2003278security@mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-01/security@mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-03/security@mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-04/security@mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-05/