When String.toUpperCase() caused a string to get longer it was possible for uninitialized memory to be incorporated into the result string This vulnerability affects Firefox < 136 and Thunderbird < 136.
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-1942.json"
[ { "events": [ { "introduced": "0" }, { "fixed": "136.0" } ] }, { "events": [ { "introduced": "0" }, { "fixed": "136.0" } ] } ]