Firefox 138.0.4 Release Notes
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Fixed:
https://www.mozilla.org/en-US/security/advisories/mfsa2025-36/#CVE-2025-4920
An attacker was able to perform an out-of-bounds read or write on a JavaScript Promise object.
https://www.mozilla.org/en-US/security/advisories/mfsa2025-36/#CVE-2025-4921
An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array index sizes.
