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9.8 Critical

CVE-2025-49710 An integer overflow was present in `OrderedHashTable` used by the JavaScript engine

Description

An integer overflow was present in `OrderedHashTable` used by the JavaScript engine. This vulnerability was fixed in Firefox 139.0.4.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 139.0	earliest → < 139.0.4	139.0.4

References

bugzilla.mozilla.org bugzilla.mozilla.org
www.mozilla.org www.mozilla.org

Timeline

Published June 11, 2025
Last modified July 27, 2026

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