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

Mozilla · Firefox · Published 4 Mar 2025 · Modified 30 Sept 2026

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.

References

What to do
  1. Check whether Firefox is in your asset inventory.
  2. Patch in the next maintenance window; prioritise internet-facing systems.
  3. Record the decision in your risk register for audit evidence.
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Link: adminadda.com/cve/CVE-2025-1942