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CVE PROGRAM SOURCE RECORD9.8 Critical

CVE-2025-1942

Disclosure of uninitialized memory when .toUpperCase() causes string to get longer

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mozilla Firefox

  • 136 to ≤ *unaffected

Mozilla Thunderbird

  • 136 to ≤ *unaffected

References