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Known vulnerabilities in Mozilla Thunderbird

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CVE Summary Score Published
CVE-2026-92020 Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component 8.8 High Sep 15, 2026
CVE-2026-92019 Mitigation bypass in the Remote Settings Client component 8.1 High Sep 15, 2026
CVE-2026-92018 Sandbox escape in the DOM: Core & HTML component 9.6 Critical Sep 15, 2026
CVE-2026-92017 Privilege escalation in the DOM: Service Workers component 8.8 High Sep 15, 2026
CVE-2026-92016 Use-after-free in the Disability Access APIs component 8.8 High Sep 15, 2026
CVE-2026-92015 Privilege escalation in the WebExtensions component 8.8 High Sep 15, 2026
CVE-2026-92014 Privilege escalation due to incorrect boundary conditions in the Graphics component 8.8 High Sep 15, 2026
CVE-2026-92013 Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component 8.8 High Sep 15, 2026
CVE-2026-92012 Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component 8.8 High Sep 15, 2026
CVE-2026-92011 Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component 8.8 High Sep 15, 2026
CVE-2026-92010 Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component 8.8 High Sep 15, 2026
CVE-2026-92009 Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component 8.8 High Sep 15, 2026
CVE-2026-92008 Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component 8.8 High Sep 15, 2026
CVE-2026-92007 Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component 8.8 High Sep 15, 2026
CVE-2026-92006 Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component 8.8 High Sep 15, 2026
CVE-2026-92005 Use-after-free in the Audio/Video: Web Codecs component 5.3 Medium Sep 15, 2026
CVE-2026-84641 A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID response 7.5 High Sep 1, 2026
CVE-2026-84642 The values of the mail.allowed_attachment_hostnames advanced config setting were used in a regular expression without… 7.5 High Sep 1, 2026
CVE-2026-84639 Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used 9.1 Critical Sep 1, 2026
CVE-2026-84640 A maliciously constructed mail header could lead to a one byte read past the end of a buffer 7.5 High Sep 1, 2026
CVE-2026-84637 Malicious calendar invitations could use file URI attachments to launch local or network-hosted executables on… 9.8 Critical Sep 1, 2026
CVE-2026-84144 Internally found bugs present in Thunderbird 154 and Thunderbird ESR 153.1 7.5 High Sep 1, 2026
CVE-2026-84143 Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14 9.8 Critical Sep 1, 2026
CVE-2026-84142 Internally found bugs present in Thunderbird 154 9.8 Critical Sep 1, 2026
CVE-2026-84141 Integer overflow in the Graphics: ImageLib component 9.8 Critical Sep 1, 2026

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