Mozilla Thunderbird vulnerabilities
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Published CVEs affecting Mozilla Thunderbird: 523 record(s), with affected versions and fixes.cpe:2.3:a:mozilla:thunderbird
CVE-2026-5731
Critical · 9.8
CWE-119 Apr 7, 2026
Memory safety bugs fixed in Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2
Memory safety bugs present in Firefox ESR 115.34.0, Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149.0.2, Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.
CVE-2026-4371
High · 7.4
CWE-126 Mar 24, 2026
Out of bounds read in IMAP parsing
A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.
CVE-2026-3889
Medium · 6.5
CWE-451 Mar 24, 2026
Spoofing issue in Thunderbird
Spoofing issue in Thunderbird. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.
CVE-2026-4729
Critical · 9.8
CWE-120 Mar 24, 2026
Memory safety bugs fixed in Firefox 149 and Thunderbird 149
Memory safety bugs present in Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
CVE-2026-4728
Medium · 6.5
CWE-290 Mar 24, 2026
Spoofing issue in the Privacy: Anti-Tracking component
Spoofing issue in the Privacy: Anti-Tracking component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
CVE-2026-4727
High · 7.5
CWE-400 Mar 24, 2026
Denial-of-service in the Libraries component in NSS
Denial-of-service in the Libraries component in NSS. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
CVE-2026-4726
High · 7.5
CWE-400 Mar 24, 2026
Denial-of-service in the XML component
Denial-of-service in the XML component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
CVE-2026-4724
Critical · 9.1
CWE-758 Mar 24, 2026
Undefined behavior in the Audio/Video component
Undefined behavior in the Audio/Video component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
CVE-2026-4721
Critical · 9.8
CWE-120 Mar 24, 2026
Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149
Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
CVE-2026-4720
Critical · 9.8
CWE-120 Mar 24, 2026
Memory safety bugs fixed in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149
Memory safety bugs present in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
CVE-2026-4718
High · 8.1
CWE-758 Mar 24, 2026
Undefined behavior in the WebRTC: Signaling component
Undefined behavior in the WebRTC: Signaling component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
CVE-2026-4710
Critical · 9.8
CWE-119 Mar 24, 2026
Incorrect boundary conditions in the Audio/Video component
Incorrect boundary conditions in the Audio/Video component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
CVE-2026-4694
High · 7.5
CWE-190 Mar 24, 2026
Incorrect boundary conditions, integer overflow in the Graphics component
Incorrect boundary conditions, integer overflow in the Graphics component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
CVE-2026-4692
Critical · 10.0
CWE-653 Mar 24, 2026
Sandbox escape in the Responsive Design Mode component
Sandbox escape in the Responsive Design Mode component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
CVE-2026-4689
Critical · 10.0
CWE-190 Mar 24, 2026
Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component
Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
CVE-2026-2807
Critical · 9.8
CWE-787 Feb 24, 2026
Memory safety bugs fixed in Firefox 148 and Thunderbird 148
Memory safety bugs present in Firefox 147 and Thunderbird 147. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
CVE-2026-2806
Critical · 9.1
CWE-908 Feb 24, 2026
Uninitialized memory in the Graphics: Text component
Uninitialized memory in the Graphics: Text component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
CVE-2026-2805
Critical · 9.8
CWE-824 Feb 24, 2026
Invalid pointer in the DOM: Core & HTML component
Invalid pointer in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
CVE-2026-2804
Medium · 5.4
CWE-416 Feb 24, 2026
Use-after-free in the JavaScript: WebAssembly component
Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
CVE-2026-2803
High · 7.5
CWE-200 Feb 24, 2026
Information disclosure, mitigation bypass in the Settings UI component
Information disclosure, mitigation bypass in the Settings UI component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
CVE-2026-2802
Medium · 4.2
CWE-362 Feb 24, 2026
Race condition in the JavaScript: GC component
Race condition in the JavaScript: GC component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
CVE-2026-2801
High · 7.5
CWE-754 Feb 24, 2026
Incorrect boundary conditions in the JavaScript: WebAssembly component
Incorrect boundary conditions in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
CVE-2026-2800
Critical · 9.8
CWE-290 Feb 24, 2026
Spoofing issue in the WebAuthn component in Firefox for Android
Spoofing issue in the WebAuthn component in Firefox for Android. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
CVE-2026-2799
Critical · 9.8
CWE-416 Feb 24, 2026
Use-after-free in the DOM: Core & HTML component
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
CVE-2026-2798
High · 8.8
CWE-416 Feb 24, 2026
Use-after-free in the DOM: Core & HTML component
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.