Description
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.
Scores
CVSS v3
9.8
EPSS
0.0048
EPSS Percentile
65.1%
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