Memory Safety Bugs in Firefox and Thunderbird by Mozilla
CVE-2026-0892

9.8CRITICAL

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
13 January 2026

What is CVE-2026-0892?

Memory safety bugs have been detected in Firefox and Thunderbird versions 146, which exhibit signs of memory corruption. These vulnerabilities potentially allow for exploitation, enabling the execution of arbitrary code if leveraged effectively. Users are encouraged to update to Firefox and Thunderbird versions 147 or later to mitigate any risks associated with these issues.

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Affected Version(s)

Firefox < 147

Thunderbird < 147

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1986912%2...
https://www.mozilla.org/security/advisories/mfsa2026-01/
https://www.mozilla.org/security/advisories/mfsa2026-04/

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Hiroyuki Ikezoe, Jon Coppeard, Maurice Dauer and the Mozilla Fuzzing Team
JSON
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