CVE-2025-1942 Information

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 affects Firefox < 136 and Thunderbird < 136.

Reference

https://bugzilla.mozilla.org/show_bug.cgi?id=1947139 https://www.mozilla.org/security/advisories/mfsa2025-14/ https://www.mozilla.org/security/advisories/mfsa2025-17/