Skip to content
Sign in
9.8 Critical

CVE-2025-1942 When String.toUpperCase() caused a string to get longer it was possible for uninitialized memory to be incorporated into…

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.

Affected products and versions

Product Affected versions Fixed in
Firefox 136 earliest → < 136 136
Thunderbird 136 earliest → < 136 136

Other CVEs of Firefox

The 2221 CVEs of Firefox →
CVE-2026-120572 Incorrect boundary conditions in the Layout: Block and Inline component 8.8 High CVE-2026-118027 Frame poisoning in the Layout component 9.1 Critical CVE-2026-118025 Other issue in the SVG component 8.8 High CVE-2026-118024 Use-after-free in the Graphics: Text component 8.8 High
Track this CVE