CVE-2026-8974
HIGHMemory safety bugs fixed in Thunderbird 140.11 and Thunderbird 151
Title source: cnaDescription
Memory safety bugs present in Thunderbird 140.10 and Thunderbird 150. 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 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
References (5)
Core 5
Core References
Memory safety bugs fixed in Thunderbird 140.11 and Thunderbird 151
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1784128%2C1883230%2C1983677%2C2022390%2C2023116%2C2023657%2C2024255%2C2024418%2C2024441%2C2024447%2C2024966%2C2025412%2C2025467%2C2025940%2C2025950%2C2025956%2C2026284%2C2027247%2C2027255%2C2027288%2C2027306%2C2027322%2C2027332%2C2027333%2C2028266%2C2028292%2C2028319%2C2028526%2C2028870%2C2028876%2C2028882%2C2029062%2C2029309%2C2029414%2C2029422%2C2029428%2C2029447%2C2029732%2C2029785%2C2029793%2C2029813%2C2029899%2C2031028%2C2031457%2C2032039%2C2033610%2C2033854%2C2034498%2C2034628%2C2034978%2C2035966%2C2036668%2C2036905%2C2036930
Scores
CVSS v3
8.8
EPSS
0.0004
EPSS Percentile
12.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-119
Status
published
Products (8)
mozilla/firefox
< 140.11.0
mozilla/firefox
< 151.0.0
Mozilla/Firefox
140.11 - 140.*
Mozilla/Firefox
151
mozilla/thunderbird
< 140.11
mozilla/thunderbird
< 151.0.0
Mozilla/Thunderbird
140.11 - 140.*
Mozilla/Thunderbird
151
Published
May 19, 2026
Tracked Since
May 19, 2026