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9.8 Critical

CVE-2026-74964 Integer overflow in the Graphics component

Description

Integer overflow in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 154	earliest → < 154	154
Firefox 153.1	earliest → < 153.1	153.1
Firefox 140.14	earliest → < 140.14	140.14
Thunderbird 154	earliest → < 154	154
Thunderbird 153.1	earliest → < 153.1	153.1
Thunderbird 140.14	earliest → < 140.14	140.14

References

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

Timeline

Published August 18, 2026
Last modified August 19, 2026

The 2221 CVEs of Firefox →

CVE-2026-120572 Incorrect boundary conditions in the Layout: Block and Inline component 8.8 High CVE-2026-118027 Frame poisoning in the Layout component 9.1 Critical CVE-2026-118024 Use-after-free in the Graphics: Text component 8.8 High CVE-2026-118025 Other issue in the SVG component 8.8 High

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