CVE-2025-1942
CRITICALFirefox < 136.0 - Use of Uninitialized Resource via String.toUpperCase()
Title source: llmDescription
When String.toUpperCase() caused a string to get longer it was possible for uninitialized memory to be incorporated into the result string. This vulnerability was fixed in Firefox 136 and Thunderbird 136.
References (3)
Core 3
Core References
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=1947139
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-14/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-17/
Scores
CVSS v3
9.8
EPSS
0.0045
EPSS Percentile
35.3%
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-908
Status
published
Products (4)
mozilla/firefox
< 136.0
Mozilla/Firefox
136
mozilla/thunderbird
< 136.0
Mozilla/Thunderbird
136
Published
Mar 04, 2025
Tracked Since
Feb 18, 2026