Description
Memory safety bugs present in Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147. 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 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
References (6)
Core 6
Core References
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-13/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-14/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-15/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-16/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-17/
Scores
CVSS v3
9.8
EPSS
0.0007
EPSS Percentile
22.3%
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
no
Technical Impact
total
Details
CWE
CWE-787
Status
published
Products (9)
mozilla/firefox
< 115.33.0
mozilla/firefox
< 148.0
Mozilla/Firefox
115.33 - 115.*
Mozilla/Firefox
140.8 - 140.*
Mozilla/Firefox
148
mozilla/thunderbird
< 140.8.0
mozilla/thunderbird
< 148.0
Mozilla/Thunderbird
140.8 - 140.*
Mozilla/Thunderbird
148
Published
Feb 24, 2026
Tracked Since
Feb 24, 2026