Mozilla Thunderbird vulnerabilities
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Published CVEs affecting Mozilla Thunderbird: 534 record(s), with affected versions and fixes.cpe:2.3:a:mozilla:thunderbird
CVE-2026-92013
High · 8.8
CWE-120 Sep 15, 2026
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
CVE-2026-92012
High · 8.8
CWE-120 Sep 15, 2026
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
CVE-2026-92011
High · 8.8
CWE-120 Sep 15, 2026
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
CVE-2026-92010
High · 8.8
CWE-120 Sep 15, 2026
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
CVE-2026-92009
High · 8.8
CWE-120 Sep 15, 2026
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
CVE-2026-92008
High · 8.8
CWE-120 Sep 15, 2026
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
CVE-2026-92007
High · 8.8
CWE-120 Sep 15, 2026
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
CVE-2026-92006
High · 8.8
CWE-120 Sep 15, 2026
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
CVE-2026-92005
Medium · 5.3
CWE-416 Sep 15, 2026
Use-after-free in the Audio/Video: Web Codecs component
Use-after-free in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
CVE-2026-84642
High · 7.5
CWE-1333 Sep 1, 2026
Allowed UNC hostnames for attachments interpreted as a regular expression
The values of the mail.allowed_attachment_hostnames advanced config setting were used in a regular expression without escaping. For some possible valid hostnames, this could allow certain unintended hostnames to also match and serve remote attachments. This vulnerability was fixed in Thunderbird 155 and Thunderbird 153.2.
CVE-2026-84641
High · 7.5
CWE-416 Sep 1, 2026
Information disclosure due to malicious IMAP server response
A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID response. Heap contents can ultimately be persisted to prefs.js. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
CVE-2026-84640
High · 7.5
CWE-126 Sep 1, 2026
One byte overflow read in mail parser
A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
CVE-2026-84639
Critical · 9.1
CWE-457 Sep 1, 2026
Uninitialized memory in MIME parsing
Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
CVE-2026-84637
Critical · 9.8
CWE-434 Sep 1, 2026
Calendar invitation attachments could launch local executables
Malicious calendar invitations could use file URI attachments to launch local or network-hosted executables on Windows, bypassing Thunderbird's normal executable attachment protections. With the new invitation display enabled, the attachment could also appear under a misleading filename. This vulnerability was fixed in Thunderbird 154 and Thunderbird 153.2.
CVE-2026-84145
High · 7.5
CWE-119 Sep 1, 2026
Internally found bugs fixed in Thunderbird 155, Thunderbird ESR 153.2 and Thunderbird ESR 140.15
Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
CVE-2026-84144
High · 7.5
CWE-119 Sep 1, 2026
Internally found bugs fixed in Thunderbird 155 and Thunderbird ESR 153.2
Internally found bugs present in Thunderbird 154 and Thunderbird ESR 153.1. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
CVE-2026-84143
Critical · 9.8
CWE-119 Sep 1, 2026
Internally found bugs fixed in Thunderbird 155, Thunderbird ESR 153.2 and Thunderbird ESR 140.15
Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
CVE-2026-84142
Critical · 9.8
CWE-119 Sep 1, 2026
Internally found bugs fixed in Thunderbird 155
Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155 and Thunderbird 155.
CVE-2026-84141
Critical · 9.8
CWE-190 Sep 1, 2026
Integer overflow in the Graphics: ImageLib component
Integer overflow in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
CVE-2026-84140
Critical · 9.8
CWE-346 Sep 1, 2026
Site isolation issue in the DOM: Navigation component
Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
CVE-2026-84139
Medium · 6.1
CWE-1021 Sep 1, 2026
Clickjacking issue in the DOM: Events component
Clickjacking issue in the DOM: Events component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
CVE-2026-84138
Medium · 6.5
CWE-400 Sep 1, 2026
Denial-of-service in the PDF Viewer component
Denial-of-service in the PDF Viewer component. This vulnerability was fixed in Firefox 155 and Thunderbird 155.
CVE-2026-84137
Medium · 4.3
CWE-346 Sep 1, 2026
Spoofing issue in the DOM: Core & HTML component
Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
CVE-2026-84136
Medium · 6.1
CWE-79 Sep 1, 2026
Other issue in the DOM: Navigation component
Other issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
CVE-2026-84134
Critical · 9.8
CWE-200 Sep 1, 2026
Other issue in the Profile Backup component
Other issue in the Profile Backup component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.