Mozilla Thunderbird vulnerabilities

CVE-2026-109753 Mozilla Foundation Security Advisory 2026-109: CVE-2026-109753 Mozilla Foundation Security Advisory 2026-109 CVE: CVE-2026-109753 Product: Thunderbird Impact: low Fixed in: Thunderbird 158

CVE-2026-109766 Mozilla Foundation Security Advisory 2026-109: CVE-2026-109766 Mozilla Foundation Security Advisory 2026-109 CVE: CVE-2026-109766 Product: Thunderbird Impact: low Fixed in: Thunderbird 158

CVE-2026-109760 Mozilla Foundation Security Advisory 2026-110: CVE-2026-109760 Mozilla Foundation Security Advisory 2026-110 CVE: CVE-2026-109760 Product: Thunderbird Impact: low Fixed in: Thunderbird 153.5

CVE-2026-109737 Mozilla Foundation Security Advisory 2026-110: CVE-2026-109737 Mozilla Foundation Security Advisory 2026-110 CVE: CVE-2026-109737 Product: Thunderbird Impact: low Fixed in: Thunderbird 153.5

CVE-2016-1954 [HIGH] CWE-264 CVE-2016-1954: The nsCSPContext::SendReports function in dom/security/nsCSPContext.cpp in Mozilla Firefox before 45 The nsCSPContext::SendReports function in dom/security/nsCSPContext.cpp in Mozilla Firefox before 45.0 and Firefox ESR 38.x before 38.7 does not prevent use of a non-HTTP report-uri for a Content Security Policy (CSP) violation report, which allows remote attackers to cause a denial of service (data overwrite) or possibly gain privileges by specifying a

CVE-2020-12419 [HIGH] CWE-416 CVE-2020-12419: When processing callbacks that occurred during window flushing in the parent process, the associated When processing callbacks that occurred during window flushing in the parent process, the associated window may die; causing a use-after-free condition. This could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.10, Firefox < 78, and Thunderbird < 68.10.0.

CVE-2026-109722 Mozilla Foundation Security Advisory 2026-110: CVE-2026-109722 Mozilla Foundation Security Advisory 2026-110 CVE: CVE-2026-109722 Product: Thunderbird Impact: low Fixed in: Thunderbird 153.5

CVE-2017-5436 [HIGH] CWE-787 CVE-2017-5436: An out-of-bounds write in the Graphite 2 library triggered with a maliciously crafted Graphite font. An out-of-bounds write in the Graphite 2 library triggered with a maliciously crafted Graphite font. This results in a potentially exploitable crash. This issue was fixed in the Graphite 2 library as well as Mozilla products. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.

CVE-2013-5599 [CRITICAL] CVE-2013-5599: Use-after-free vulnerability in the nsIPresShell::GetPresContext function in the PresShell (aka pres Use-after-free vulnerability in the nsIPresShell::GetPresContext function in the PresShell (aka presentation shell) implementation in Mozilla Firefox before 25.0, Firefox ESR 17.x before 17.0.10 and 24.x before 24.1, Thunderbird before 24.1, Thunderbird ESR 17.x before 17.0.10, and SeaMonkey before 2.22 allows remote attackers to execute arbitrary code or c

CVE-2020-6514 [MEDIUM] CVE-2020-6514: Inappropriate implementation in WebRTC in Google Chrome prior to 84 Inappropriate implementation in WebRTC in Google Chrome prior to 84.0.4147.89 allowed an attacker in a privileged network position to potentially exploit heap corruption via a crafted SCTP stream.

CVE-2019-17005 [HIGH] CWE-787 CVE-2019-17005: The plain text serializer used a fixed-size array for the number of <ol> elements it could process; The plain text serializer used a fixed-size array for the number of elements it could process; however it was possible to overflow the static-sized array leading to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 68.3, Firefox ESR < 68.3, and Firefox < 71.

CVE-2021-38504 [HIGH] CWE-416 CVE-2021-38504: When interacting with an HTML input element's file picker dialog with webkitdirectory set, a use-aft When interacting with an HTML input element's file picker dialog with webkitdirectory set, a use-after-free could have resulted, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

CVE-2008-4060 [HIGH] CWE-264 CVE-2008-4060: Mozilla Firefox before 2.0.0.17 and 3.x before 3.0.2, Thunderbird before 2.0.0.17, and SeaMonkey bef Mozilla Firefox before 2.0.0.17 and 3.x before 3.0.2, Thunderbird before 2.0.0.17, and SeaMonkey before 1.1.12 allow remote attackers to create documents that lack script-handling objects, and execute arbitrary code with chrome privileges, via vectors related to (1) the document.loadBindingDocument function and (2) XSLT.

CVE-2012-1954 [CRITICAL] CWE-399 CVE-2012-1954: Use-after-free vulnerability in the nsDocument::AdoptNode function in Mozilla Firefox 4.x through 13 Use-after-free vulnerability in the nsDocument::AdoptNode function in Mozilla Firefox 4.x through 13.0, Firefox ESR 10.x before 10.0.6, Thunderbird 5.0 through 13.0, Thunderbird ESR 10.x before 10.0.6, and SeaMonkey before 2.11 allows remote attackers to cause a denial of service (heap memory corruption) or possibly execute arbitrary code via vector

CVE-2011-2376 [CRITICAL] CVE-2011-2376: Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 3.6.18 and Thun Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 3.6.18 and Thunderbird before 3.1.11 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.

CVE-2012-4216 [CRITICAL] CWE-416 CVE-2012-4216: Use-after-free vulnerability in the gfxFont::GetFontEntry function in Mozilla Firefox before 17.0, F Use-after-free vulnerability in the gfxFont::GetFontEntry function in Mozilla Firefox before 17.0, Firefox ESR 10.x before 10.0.11, Thunderbird before 17.0, Thunderbird ESR 10.x before 10.0.11, and SeaMonkey before 2.14 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.

CVE-2014-1479 [HIGH] CVE-2014-1479: The System Only Wrapper (SOW) implementation in Mozilla Firefox before 27.0, Firefox ESR 24.x before The System Only Wrapper (SOW) implementation in Mozilla Firefox before 27.0, Firefox ESR 24.x before 24.3, Thunderbird before 24.3, and SeaMonkey before 2.24 does not prevent certain cloning operations, which allows remote attackers to bypass intended restrictions on XUL content via vectors involving XBL content scopes.

CVE-2020-26959 [HIGH] CWE-416 CVE-2020-26959: During browser shutdown, reference decrementing could have occured on a previously freed object, res During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

CVE-2020-35112 [HIGH] CVE-2020-35112: If a user downloaded a file lacking an extension on Windows, and then "Open"-ed it from the download If a user downloaded a file lacking an extension on Windows, and then "Open"-ed it from the downloads panel, if there was an executable file in the downloads directory with the same name but with an executable extension (such as .bat or .exe) that executable would have been launched instead. *Note: This issue only affected Windows operating systems. Other ope

CVE-2021-38495 [HIGH] CWE-787 CVE-2021-38495: Mozilla developers reported memory safety bugs present in Thunderbird 78.13.0. Some of these bugs sh Mozilla developers reported memory safety bugs present in Thunderbird 78.13.0. 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 affects Thunderbird < 91.1 and Firefox ESR < 91.1.