Mozilla Thunderbird vulnerabilities

CVE-2025-4084 [MEDIUM] CWE-116 CVE-2025-4084: Due to insufficient escaping of the special characters in the "copy as cURL" feature, an attacker co Due to insufficient escaping of the special characters in the "copy as cURL" feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system. *This bug only affects Firefox for Windows. Other versions of Firefox are unaffected.*. This vulnerability was fixed in Firefox ESR 128.10, Firef

CVE-2025-3523 [MEDIUM] CWE-451 CVE-2025-3523: When an email contains multiple attachments with external links via the X-Mozilla-External-Attachmen When an email contains multiple attachments with external links via the X-Mozilla-External-Attachment-URL header, only the last link is shown when hovering over any attachment. Although the correct link is used on click, the misleading hover text could trick users into downloading content from untrusted sources. This vulnerability was fixed in Thunder

CVE-2025-2830 [MEDIUM] CWE-22 CVE-2025-2830: By crafting a malformed file name for an attachment in a multipart message, an attacker can trick Th By crafting a malformed file name for an attachment in a multipart message, an attacker can trick Thunderbird into including a directory listing of /tmp when the message is forwarded or edited as a new message. This vulnerability could allow attackers to disclose sensitive information from the victim's system. This vulnerability is not limited to Linux

CVE-2025-3522 [MEDIUM] CWE-601 CVE-2025-3522: Thunderbird processes the X-Mozilla-External-Attachment-URL header to handle attachments which can b Thunderbird processes the X-Mozilla-External-Attachment-URL header to handle attachments which can be hosted externally. When an email is opened, Thunderbird accesses the specified URL to determine file size, and navigates to it when the user clicks the attachment. Because the URL is not validated or sanitized, it can reference internal resources like

CVE-2025-3029 [HIGH] CWE-290 CVE-2025-3029: A crafted URL containing specific Unicode characters could have hidden the true origin of the page, A crafted URL containing specific Unicode characters could have hidden the true origin of the page, resulting in a potential spoofing attack. This vulnerability was fixed in Firefox 137, Firefox ESR 128.9, Thunderbird 137, and Thunderbird 128.9.

CVE-2025-3034 [HIGH] CWE-787 CVE-2025-3034: Memory safety bugs present in Firefox 136 and Thunderbird 136. Some of these bugs showed evidence of Memory safety bugs present in Firefox 136 and Thunderbird 136. 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 137 and Thunderbird 137.

CVE-2025-3030 [HIGH] CWE-416 CVE-2025-3030: Memory safety bugs present in Firefox 136, Thunderbird 136, Firefox ESR 128.8, and Thunderbird 128.8 Memory safety bugs present in Firefox 136, Thunderbird 136, Firefox ESR 128.8, and Thunderbird 128.8. 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 137, Firefox ESR 128.9, Thunderbird 137, and Thunderbir

CVE-2025-3032 [HIGH] CWE-403 CVE-2025-3032: Leaking of file descriptors from the fork server to web content processes could allow for privilege Leaking of file descriptors from the fork server to web content processes could allow for privilege escalation attacks. This vulnerability was fixed in Firefox 137 and Thunderbird 137.

CVE-2025-3033 [HIGH] CWE-73 CVE-2025-3033: After selecting a malicious Windows `.url` shortcut from the local filesystem, an unexpected file co After selecting a malicious Windows `.url` shortcut from the local filesystem, an unexpected file could be uploaded. *This bug only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability was fixed in Firefox 137 and Thunderbird 137.

CVE-2025-3028 [MEDIUM] CWE-416 CVE-2025-3028: JavaScript code running while transforming a document with the XSLTProcessor could lead to a use-aft JavaScript code running while transforming a document with the XSLTProcessor could lead to a use-after-free. This vulnerability was fixed in Firefox 137, Firefox ESR 115.22, Firefox ESR 128.9, Thunderbird 137, and Thunderbird 128.9.

CVE-2025-3031 [MEDIUM] CWE-200 CVE-2025-3031: An attacker could read 32 bits of values spilled onto the stack in a JIT compiled function. This vul An attacker could read 32 bits of values spilled onto the stack in a JIT compiled function. This vulnerability was fixed in Firefox 137 and Thunderbird 137.

CVE-2025-26696 [HIGH] CWE-290 CVE-2025-26696: Certain crafted MIME email messages that claimed to contain an encrypted OpenPGP message, which inst Certain crafted MIME email messages that claimed to contain an encrypted OpenPGP message, which instead contained an OpenPGP signed message, were wrongly shown as being encrypted. This vulnerability was fixed in Thunderbird 136 and Thunderbird 128.8.

CVE-2025-26695 [MEDIUM] CVE-2025-26695: When requesting an OpenPGP key from a WKD server, an incorrect padding size was used and a network o When requesting an OpenPGP key from a WKD server, an incorrect padding size was used and a network observer could have learned the length of the requested email address. This vulnerability was fixed in Thunderbird 136 and Thunderbird 128.8.

CVE-2025-1942 [CRITICAL] CWE-908 CVE-2025-1942: When String.toUpperCase() caused a string to get longer it was possible for uninitialized memory to When String.toUpperCase() caused a string to get longer it was possible for uninitialized memory to be incorporated into the result string. This vulnerability was fixed in Firefox 136 and Thunderbird 136.

CVE-2025-1937 [HIGH] CWE-1260 CVE-2025-1937: Memory safety bugs present in Firefox 135, Thunderbird 135, Firefox ESR 115.20, Firefox ESR 128.7, a Memory safety bugs present in Firefox 135, Thunderbird 135, Firefox ESR 115.20, Firefox ESR 128.7, and Thunderbird 128.7. 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 136, Firefox ESR 115.21, Firefox E

CVE-2025-1932 [HIGH] CWE-125 CVE-2025-1932: An inconsistent comparator in xslt/txNodeSorter could have resulted in potentially exploitable out-o An inconsistent comparator in xslt/txNodeSorter could have resulted in potentially exploitable out-of-bounds access. Only affected version 122 and later. This vulnerability was fixed in Firefox 136, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.

CVE-2025-1930 [HIGH] CWE-416 CVE-2025-1930: On Windows, a compromised content process could use bad StreamData sent over AudioIPC to trigger a u On Windows, a compromised content process could use bad StreamData sent over AudioIPC to trigger a use-after-free in the Browser process. This could have led to a sandbox escape. This vulnerability was fixed in Firefox 136, Firefox ESR 115.21, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.

CVE-2025-1943 [HIGH] CWE-122 CVE-2025-1943: Memory safety bugs present in Firefox 135 and Thunderbird 135. Some of these bugs showed evidence of Memory safety bugs present in Firefox 135 and Thunderbird 135. 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 136 and Thunderbird 136.

CVE-2025-1933 [HIGH] CVE-2025-1933: On 64-bit CPUs, when the JIT compiles WASM i32 return values they can pick up bits from left over me On 64-bit CPUs, when the JIT compiles WASM i32 return values they can pick up bits from left over memory. This can potentially cause them to be treated as a different type. This vulnerability was fixed in Firefox 136, Firefox ESR 115.21, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.

CVE-2025-1936 [HIGH] CWE-158 CVE-2025-1936: jar: URLs retrieve local file content packaged in a ZIP archive. The null and everything after it wa jar: URLs retrieve local file content packaged in a ZIP archive. The null and everything after it was ignored when retrieving the content from the archive, but the fake extension after the null was used to determine the type of content. This could have been used to hide code in a web extension disguised as something else like an image. This vulnerabilit