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Known vulnerabilities in Mozilla Thunderbird

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CVE Summary Score Published
CVE-2026-16369 Integer overflow in the JavaScript: WebAssembly component 9.8 Critical Jul 21, 2026
CVE-2026-16367 Sandbox escape due to invalid pointer in the Disability Access APIs component 10.0 Critical Jul 21, 2026
CVE-2026-16368 Incorrect boundary conditions in the JavaScript: WebAssembly component 9.8 Critical Jul 21, 2026
CVE-2026-16354 Information disclosure in the Graphics: ImageLib component 7.5 High Jul 21, 2026
CVE-2026-16353 Invalid pointer in the DOM: Bindings (WebIDL) component 9.8 Critical Jul 21, 2026
CVE-2026-16366 Privilege escalation in the DOM: Navigation component 8.8 High Jul 21, 2026
CVE-2026-16365 Privilege escalation in the DOM: Workers component 8.8 High Jul 21, 2026
CVE-2026-16363 JIT miscompilation in the JavaScript: WebAssembly component 9.8 Critical Jul 21, 2026
CVE-2026-16364 Incorrect boundary conditions in the Audio/Video: Playback component 9.1 Critical Jul 21, 2026
CVE-2026-16352 Sandbox escape due to use-after-free in the Disability Access APIs component 9.8 Critical Jul 21, 2026
CVE-2026-16351 Sandbox escape due to use-after-free in the DOM: Navigation component 9.8 Critical Jul 21, 2026
CVE-2026-16362 Use-after-free in the WebRTC: Audio/Video component 8.8 High Jul 21, 2026
CVE-2026-16350 Incorrect boundary conditions in the Audio/Video: cubeb component 9.8 Critical Jul 21, 2026
CVE-2026-16349 Same-origin policy bypass in the DOM: Navigation component 9.8 Critical Jul 21, 2026
CVE-2026-15719 We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw 5.4 Medium Jul 14, 2026
CVE-2026-15718 We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw 4.3 Medium Jul 14, 2026
CVE-2026-57963 An attacker who can send HTML chat messages (via Matrix or XMPP) can inject arbitrary styled content, phishing links,… 6.5 Medium Jul 1, 2026
CVE-2026-57962 A malicious LDAP server, which a Thunderbird user is configured to query for address-book autocomplete, can stash… 5.3 Medium Jul 1, 2026
CVE-2026-12330 Incorrect boundary conditions in the Internationalization component 5.4 Medium Jun 16, 2026
CVE-2026-12329 Memory safety bug fixed in Thunderbird ESR 140.12 5.3 Medium Jun 16, 2026
CVE-2026-12328 Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and… 8.1 High Jun 16, 2026
CVE-2026-12327 Memory safety bugs present in Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151 8.1 High Jun 16, 2026
CVE-2026-12326 Memory safety bugs present in Firefox 151 and Thunderbird 151 8.1 High Jun 16, 2026
CVE-2026-12325 Denial-of-service in the Graphics: ImageLib component 6.5 Medium Jun 16, 2026
CVE-2026-12324 Incorrect boundary conditions in the Graphics: CanvasWebGL component 7.3 High Jun 16, 2026

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