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Critical CVEs

CVE-2026-74943 — Critical vulnerability brief

August 18, 2026CVSS 9.8

Use-after-free in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

CVSS base score: 9.8 / 10

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