CVE-2026-16361
CRITICALMemory safety bugs fixed in Firefox ESR 115.38 and Firefox ESR 140.13
Title source: cnaDescription
Memory safety bugs present in Thunderbird ESR 140.12. 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 ESR 115.38, Firefox ESR 140.13, and Thunderbird 140.13.
References (4)
Core 4
Core References
High-severity memory safety bugs fixed in Firefox ESR 115.38 and Firefox ESR 140.13
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029734%2C2036518
Scores
CVSS v3
9.8
EPSS
0.0031
EPSS Percentile
23.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
total
Details
CWE
CWE-119
Status
published
Products (5)
mozilla/firefox
< 115.38.0
Mozilla/Firefox
115.38 - 115.*
Mozilla/Firefox
140.13
mozilla/thunderbird
< 140.13.0
Mozilla/Thunderbird
140.13
Published
Jul 21, 2026
Tracked Since
Jul 21, 2026