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CVE-2025-4918

Published: May 17, 2025

Modified: Apr 13, 2026

PUBLISHED

Description

An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability was fixed in Firefox 138.0.4, Firefox ESR 128.10.1, Firefox ESR 115.23.1, Thunderbird 128.10.2, and Thunderbird 138.0.2.

Vendor	Product	Versions
Mozilla	Firefox	unaffected `115.23.1 - <= 115.` unaffected `128.10.1 - <= 128.` unaffected `138.0.4 - <= *`
Mozilla	Thunderbird	unaffected `128.10.2 - <= 128.` unaffected `138.0.2 - <= `

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1966612

https://www.mozilla.org/security/advisories/mfsa2025-36/

https://www.mozilla.org/security/advisories/mfsa2025-37/

https://www.mozilla.org/security/advisories/mfsa2025-38/

https://www.mozilla.org/security/advisories/mfsa2025-40/

https://www.mozilla.org/security/advisories/mfsa2025-41/

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