CVE-2026-0891
HIGHMozilla Firefox < 140.7.0 - Memory Corruption
Title source: ruleDescription
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.
References (5)
Scores
CVSS v3
8.1
EPSS
0.0002
EPSS Percentile
6.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Classification
CWE
CWE-119
Status
published
Affected Products (4)
mozilla/firefox
< 140.7.0
mozilla/firefox
< 147.0
mozilla/thunderbird
< 140.7.0
mozilla/thunderbird
< 147.0
Timeline
Published
Jan 13, 2026
Tracked Since
Feb 18, 2026