Security Vulnerabilities fixed in Firefox ESR 140.12 — Mozilla

Memory safety bugs present in Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. 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. Memory safety bugs present in...

Security Vulnerabilities fixed in Thunderbird 140.12 — Mozilla

Memory safety bugs present in Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. 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. Memory safety bugs present in...

Security Vulnerabilities fixed in Firefox ESR 140.11 — Mozilla

Memory safety bugs present in Firefox ESR 140.10 and Firefox 150. 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. Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and...

Security Vulnerabilities fixed in Thunderbird 150 — Mozilla

Memory safety bugs present in Firefox 149 and Thunderbird 149. 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. Memory safety bugs present in Firefox ESR 115.34, Firefox ESR 140.9,...

Security Vulnerabilities fixed in Firefox ESR 115.34.1 — Mozilla

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...

Security Vulnerabilities fixed in Thunderbird 140.9 — Mozilla

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...

Security Vulnerabilities fixed in Thunderbird 140.8 — Mozilla

Memory safety bugs present in Firefox ESR 140.7, Thunderbird ESR 140.7, 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. Memory safety bugs present in...

Security Vulnerabilities fixed in Firefox ESR 140.8 — Mozilla

Memory safety bugs present in Firefox ESR 140.7, Thunderbird ESR 140.7, 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. Memory safety bugs present in...

Security Vulnerabilities fixed in Thunderbird 147.0.2 and 140.7.2 — Mozilla

In general, these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser or browser-like contexts. CVE-2026-2447: Heap buffer overflow in libvpx Reporter jayjayjazz Impact high References Bug 2014390...

Security Vulnerabilities fixed in Firefox ESR 115.32 — Mozilla

CVE-2026-0877: Mitigation bypass in the DOM: Security component Reporter Mingi Jung 정민기입니다 Impact high References Bug 1999257 CVE-2026-0879: Sandbox escape due to incorrect boundary conditions in the Graphics component Reporter Oskar L Impact high References Bug 2004602 CVE-2026-0880: Sandbox...

Security Vulnerabilities fixed in Firefox 141 — Mozilla

On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. On arm64, a WASM brtable instruction with a lot of entries could lead to the label being too far from the instruction causing truncation and incorrec...

Security Vulnerabilities fixed in Thunderbird 138.0.2 — Mozilla

An attacker was able to perform an out-of-bounds read or write on a JavaScript Promise object. An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array index sizes...

Security vulnerability fixed in Firefox 137.0.2 — Mozilla

A race condition existed in nsHttpTransaction that could have been exploited to cause memory corruption, potentially leading to an exploitable condition...

Security Vulnerabilities fixed in Firefox ESR 128.7 — Mozilla

An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash. An attacker could have caused a use-after-free via the Custom Highlight API, leading to a potentially exploitable crash. A bug in WebAssembly code generation could have lead to a cras...

Security Vulnerabilities fixed in Thunderbird 132.0.1 — Mozilla

Using remote content in OpenPGP encrypted messages can lead to the disclosure of plaintext...

Security Vulnerabilities fixed in Thunderbird 132 — Mozilla

A permission leak could have occurred from a trusted site to an untrusted site via embed or object elements. An attacker could have caused a use-after-free when accessibility was enabled, leading to a potentially exploitable crash. The origin of an external protocol handler prompt could have been...

Mis-issued TURKTRUST certificates — Mozilla

Google reported to Mozilla that TURKTRUST, a certificate authority in Mozilla’s root program, had mis-issued two intermediate certificates to customers. The issue was not specific to Firefox but there was evidence that one of the certificates was used for man-in-the-middle MITM traffic management...

Additional protection against fraudulent DigiNotar certificates — Mozilla

Description: As more information has come to light about the attack on the DigiNotar Certificate Authority we have improved the protections added in MFSA 2011-34. The main change is to add explicit distrust to the DigiNotar root certificate and several intermediates. Removing the root as in our...

XBL scripts ran even when Javascript disabled — Mozilla

Scripts in XBL controls from web content continued to be run even when Javascript was disabled. By itself this causes no harm, but it could be combined with most script-based exploits to attack people running vulnerable versions who thought disabling javascript would protect them...

Browser responds to proxy auth request from non-proxy server (ssl/https) — Mozilla

If a proxy is configured the browser would respond to a 407 proxy auth request from any SSL-connected server rather than only responding to the configured proxy server. This could leak NTLM or SPNEGO credentials outside the organization...

Security Vulnerabilities fixed in Firefox ESR 140.14 — Mozilla

Internally found bugs present in Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153. 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. Internally found bugs present in...

Security Vulnerabilities fixed in Firefox ESR 140.10.1 — Mozilla

Memory safety bugs present in Firefox ESR 115.35.0, Firefox ESR 140.10.0 and Firefox 150.0.0. 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. Memory safety bugs present in Firefox ESR...

Security Vulnerabilities fixed in Firefox 149 — Mozilla

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. Memory safety bugs present in...

Security Vulnerabilities fixed in Firefox for iOS 147.4 — Mozilla

Malicious scripts could cause desynchronization between the address bar and web content before a response is received in Firefox iOS, allowing attacker-controlled pages to be presented under spoofed domains...

Security Vulnerabilities fixed in Firefox for iOS 147.2.1 — Mozilla

Malicious scripts that interrupt new tab page loading could cause desynchronization between the address bar and page content, allowing the attacker to spoof arbitrary HTML under a trusted domain...

Security Vulnerabilities fixed in Thunderbird 140.7 — Mozilla

Memory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146. 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...

Security Vulnerabilities fixed in Firefox ESR 115.31 — Mozilla

CVE-2025-14322: Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component Reporter Oskar L Impact high References Bug 1996473 CVE-2025-14323: Privilege escalation in the DOM: Notifications component Reporter tiebuchen Impact high References Bug 1996555...

Security Vulnerabilities fixed in Thunderbird 141 — Mozilla

On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. On arm64, a WASM brtable instruction with a lot of entries could lead to the label being too far from the instruction causing truncation and incorrec...

Security Vulnerabilities fixed in Thunderbird 135 — Mozilla

An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash. An attacker could have caused a use-after-free via the Custom Highlight API, leading to a potentially exploitable crash. The fullscreen notification is prematurely hidden when...

Security Vulnerabilities fixed in Thunderbird ESR 128.6 — Mozilla

The WebChannel API, which is used to transport various information across processes, did not check the sending principal but rather accepted the principal being sent. This could have led to privilege escalation attacks. Assuming a controlled failed memory allocation, an attacker could have caused...

UMS (USB) mounting after reboot even without unlocking — Mozilla

Clement Lefevre reported a bug in USB Mass Storage handling of Firefox OS that would allow unauthorized access to device data through the USB interface. The logic error would under certain circumstances expose USB media volumes to USB hosts while the device is locked with a pass code, for example...

Protection against fraudulent DigiNotar certificates — Mozilla

Description: Google Chrome user alibo encountered an active "man in the middle" MITM attack on secure SSL connections to Google servers. The fraudulent certificate was mis-issued by DigiNotar, a Dutch Certificate Authority. DigiNotar has reported evidence that other fraudulent certificates were...

The return of frame-injection spoofing — Mozilla

The original frame-injection spoofing bug was fixed in the Mozilla Suite 1.7 and Firefox 0.9 releases. This protection was accidentally bypassed by one of the fixes in the Firefox 1.0.3 and Mozilla Suite 1.7.7 releases...

Code execution via "Set as Wallpaper" — Mozilla

If an attacker can convince a victim to use the "Set As Wallpaper" context menu item on a specially crafted image then they can run arbitrary code on the user's computer. The image "source" must be a javascript: url containing an eval statement and such an image would get the "broken image" icon,...

Download dialog source spoofing — Mozilla

The true source of a download can be disguised by using a host name long enough that the most significant parts are truncated. Spoofing can be made even more convincing on windows if the subdomain labels contain a string of non-breaking space characters...

Synthetic middle-click event can steal clipboard contents — Mozilla

Script-generated middle-click events can steal clipboard contents on systems where that action is a paste. Middle-click paste is the default behavior on Unix systems, and a hidden option elsewhere...

Security Vulnerabilities fixed in Thunderbird 140.10.1 — Mozilla

Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. 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. Memory safety bugs present in Thunderbird ESR 140.10.0 and...

Security Vulnerabilities fixed in Firefox 149.0.2 — Mozilla

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...

Security Vulnerabilities fixed in Firefox ESR 140.9.1 — Mozilla

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...

Security Vulnerabilities fixed in Thunderbird 147 — Mozilla

Memory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146. 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. Memory safety bugs present in...

Security Vulnerabilities fixed in Firefox ESR 115.30 — Mozilla

CVE-2025-13012: Race condition in the Graphics component Reporter Irvan Kurniawan Impact high References Bug 1991458 CVE-2025-13013: Mitigation bypass in the DOM: Core & HTML component Reporter Masato Kinugawa Impact moderate References Bug 1991945 CVE-2025-13014: Use-after-free in the Audio/Vide...

Security Vulnerabilities fixed in Firefox ESR 115.28 — Mozilla

CVE-2025-10533: Integer overflow in the SVG component Reporter Andrew Creskey Impact moderate References Bug 1980788...

Security Vulnerabilities fixed in Firefox ESR 128.14 — Mozilla

An attacker was able to perform memory corruption in the GMP process which processes encrypted media. This process is also heavily sandboxed, but represents slightly different privileges from the content process. Same-origin policy bypass in the Graphics: Canvas2D component. Uninitialized memory ...

Security Vulnerabilities fixed in Focus for iOS 142 — Mozilla

Focus for iOS would not respect a Content-Disposition header of type Attachment and would incorrectly display the content inline, potentially allowing for XSS attacks Dragging JavaScript links to the URL bar in Focus for iOS could be utilized to run malicious scripts, potentially resulting in XSS...

Security Vulnerabilities fixed in Firefox for iOS 142 — Mozilla

Firefox for iOS would not respect a Content-Disposition header of type Attachment and would incorrectly display the content inline rather than downloading, potentially allowing for XSS attacks Malicious scripts utilizing repetitive JavaScript alerts could prevent client user interaction in some...

Security Vulnerabilities fixed in Firefox ESR 115.27 — Mozilla

An attacker was able to perform memory corruption in the GMP process which processes encrypted media. This process is also heavily sandboxed, but represents slightly different privileges from the content process. Same-origin policy bypass in the Graphics: Canvas2D component. Memory safety bugs...

Security Vulnerabilities fixed in Firefox ESR 140.1 — Mozilla

On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. On arm64, a WASM brtable instruction with a lot of entries could lead to the label being too far from the instruction causing truncation and incorrec...

Security Vulnerabilities fixed in Firefox 140 — Mozilla

A use-after-free in FontFaceSet resulted in a potentially exploitable crash. An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. Th...

Security Vulnerabilities fixed in Thunderbird 128.11 — Mozilla

A double-free could have occurred in vpxcodecencinitmulti after a failed allocation when initializing the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash. Error handling for script execution was incorrectly isolated from web content, which could ha...

Security Vulnerabilities fixed in Firefox ESR 128.10 — Mozilla

Mozilla Firefox's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-level updater by manipulating the file-locking behavior. By injecting code into the user-privileged process, an attacker could bypass intended access controls, allowing SYSTEM-level file...