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CVE-2026-0891

HIGH

8.1

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 affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.

CVE Details

CVSS v3.1 Score8.1

SeverityHIGH

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

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published1/13/2026

Last Modified1/22/2026

Sourcenvd

Honeypot Sightings0

Affected Products

mozilla:firefoxmozilla:thunderbird

Weaknesses (CWE)

CWE-119

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1964722%2C2000981%2C2003100%2C2003278(security@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/(security@mozilla.org)

IOC Correlations

No correlations recorded

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