Security Vulnerabilities fixed in Thunderbird 102.13.1 — Mozilla

Thunderbird allowed the Text Direction Override Unicode Character in filenames. An email attachment could be incorrectly shown as being a document file, while in fact it was an executable file. Newer versions of Thunderbird will strip the character and show the correct file extension...

Information disclosure through Resource Timing API during page navigation — Mozilla

Amazon software engineer Catalin Dumitru reported that the URLs of resources loaded after a navigation started such as in an unload event handler were leaked to the following page through the Resource Timing API. This leads to potential information disclosure...

Miscellaneous memory safety hazards (rv:46.0 / rv:45.1 / rv:38.8) — Mozilla

Mozilla developers fixed several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of these could be exploited to run...

Out-of-bounds read in HTML parser following a failed allocation — Mozilla

Security researcher Ronald Crane reported an out-of-bounds read following a failed allocation in the HTML parser while working with unicode strings. This can also affect the parsing of XML and SVG format data. This leads to a potentially exploitable crash...

Use-after-free in WebRTC when datachannel is used after being destroyed — Mozilla

Security researcher Looben Yang reported a use-after-free error in WebRTC that occurs due to timing issues in WebRTC when closing channels. WebRTC may still believe is has a datachannel open after another WebRTC function has closed it. This results in attempts to use the now destroyed datachannel...

Use-after-free setting text directionality — Mozilla

Security researcher regenrecht reported, via TippingPoint's Zero Day Initiative, a use-after-free during text layout when interacting with the setting of text direction. This results in a use-after-free which can lead to arbitrary code execution...

Miscellaneous memory safety hazards (rv:32.0 / rv:31.1 / rv:24.8) — Mozilla

Mozilla developers and community identified and fixed several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of the...

Location object security checks bypassed by chrome code — Mozilla

Mozilla security researcher mozbugra4 reported that certain security checks in the location object can be bypassed if chrome code is called content in a specific manner. This allowed for the loading of restricted content. This can be combined with other issues to become potentially exploitable...

Crash scaling <video> to extreme sizes — Mozilla

sczimmer reported a crash when scaling an OGG element to extreme sizes...

XSS via plugins and shadowed window.location object — Mozilla

Mozilla developer Boris Zbarsky reported that a frame named "location" could shadow the window.location object unless a script in a page grabbed a reference to the true object before the frame was created. Because some plugins use the value of window.location to determine the page origin this cou...

Security Vulnerabilities fixed in Firefox 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 115.3 — Mozilla

A compromised content process could have provided malicious data to FilterNodeD2D1 resulting in an out-of-bounds write, leading to a potentially exploitable crash in a privileged process.This bug only affects Firefox on Windows. Other operating systems are unaffected. A compromised content proces...

Security Vulnerabilities fixed in Firefox ESR 102.5 — Mozilla

Service Workers should not be able to infer information about opaque cross-origin responses; but timing information for cross-origin media combined with Range requests might have allowed them to determine the presence or length of a media file. Through a series of popup and window.print calls, an...

Inconsistent video sharing within iframe — Mozilla

Mozilla developers Eric Shepherd and Jan-Ivar Bruaroey reported issues with privacy and video sharing using WebRTC. Once video sharing has started within a WebRTC session running within an , video will continue to be shared even if the user selects the Stop Sharing" button in the controls. The...

Miscellaneous memory safety hazards (rv:25.0 / rv:24.1 / rv:17.0.10) — Mozilla

Mozilla developers identified and fixed several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of these could be...

Use-after-free and buffer overflow issues found using Address Sanitizer — Mozilla

Security researcher Abhishek Arya Inferno of the Google Chrome Security Team discovered a series critically rated of use-after-free and buffer overflow issues using the Address Sanitizer tool in shipped software. These issues are potentially exploitable, allowing for remote code execution. We wou...

Content Security Policy 1.0 implementation errors cause data leakage — Mozilla

Security researcher Karthikeyan Bhargavan of Prosecco at INRIA reported Content Security Policy CSP 1.0 implementation errors. CSP violation reports generated by Firefox and sent to the "report-uri" location include sensitive data within the "blocked-uri" parameter. These include fragment...

Use-after-free error in JSON.stringify — Mozilla

Security researcher regenrecht reported via TippingPoint's Zero Day Initiative that a method used by JSON.stringify contained a use-after-free error in which a currently in-use pointer was freed and subsequently dereferenced. This could lead to arbitrary code execution if an attacker was able to...

Security Vulnerabilities fixed in Firefox ESR 115.10 — Mozilla

GetBoundName could return the wrong version of an object when JIT optimizations were applied. In some code patterns the JIT incorrectly optimized switch statements and generated code with out-of-bounds-reads. The JIT created incorrect code for arguments in certain cases. This led to potential...

Security Vulnerabilities fixed in Firefox ESR 91.2 — Mozilla

During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. Through use of reportValidity and window.open, a plain-text validation message could have been overlaid on another origin, leading to...

Mixed content WebSocket policy bypass through workers — Mozilla

Mozilla developer Ehsan Akhgari reported a mechanism through which a web worker could be used to bypass secure requirements for WebSockets when workers are used to create WebSockets. This allows for the bypassing of mixed content WebSocket policy...

Mozilla Windows updater can be run outside of application directory — Mozilla

Security researcher Holger Fuhrmannek previously reported CVE-2015-0833, which was fixed in MFSA2015-12. That flaw allowed for the updater to load binary DLL format files from the local working directory or from the Windows temporary directories. During the fixing of CVE-2015-0833, the need to...

Caja Compiler JavaScript sandbox bypass — Mozilla

Mozilla developer Jan de Mooij reported an issue that affects web content that relies on the Caja Compiler for protection, or other similar sandboxing libraries. He found that some JavaScript objects marked as non-extensible within Caja and Secure EcmaScript could be made extensible again,...

Uninitialized memory use during GIF rendering — Mozilla

Google security researcher Michal Zalewski discovered that when a malformated GIF image is rendered in certain circumstances, memory is not properly initialized before use. The resulting image then uses this memory during rendering. This could allow for the a script in web content to access this...

User-defined properties on DOM proxies get the wrong "this" object — Mozilla

Mozilla developer Boris Zbarsky reported that user-defined getters on DOM proxies would incorrectly get the expando object as this. It is unlikely that this is directly exploitable but could lead to JavaScript client or add-on code making incorrect security sensitive decisions based on hacker...

Out-of-bounds read in format-number in XSLT — Mozilla

Security research Nicolas Grégoire used the Address Sanitizer tool to discover an out-of-bounds read in the format-number feature of XSLT, which can cause inaccurate formatting of numbers and information leakage. This is not directly exploitable...

Buffer overflow and use-after-free issues found using Address Sanitizer — Mozilla

Security researcher Abhishek Arya of Google used the Address Sanitizer tool to uncover several issues: two heap buffer overflow bugs and a use-after-free problem. The first heap buffer overflow was found in conversion from unicode to native character sets when the function fails. The use-after-fr...

Cross-origin data theft using canvas and Windows D2D — Mozilla

Mozilla developer Bas Schouten reported that the introduction of the "Azure" graphics back-end on Windows in Firefox 7 re-introduced the cross-origin data theft issue reported by nasalislarvatus3000 as described in MFSA 2011-29...

Security Vulnerabilities fixed in Firefox 150.0.3 — Mozilla

CVE-2026-8388: Incorrect boundary conditions in the JavaScript Engine: JIT component Reporter ggwhyp Impact high References Bug 2036978 CVE-2026-8389: JIT miscompilation in the JavaScript Engine: JIT component Reporter ggwhyp Impact high References Bug 2036983 CVE-2026-8390: Use-after-free in the...

Security Vulnerability fixed in Firefox 131.0.2, Firefox ESR 128.3.1, Firefox ESR 115.16.1 — Mozilla

An attacker was able to achieve code execution in the content process by exploiting a use-after-free in Animation timelines. We have had reports of this vulnerability being exploited in the wild...

Security Vulnerabilities fixed in Firefox ESR 78.14 — Mozilla

When delegating navigations to the operating system, Firefox would accept the mk scheme which might allow attackers to launch pages and execute scripts in Internet Explorer in unprivileged mode. This bug only affects Firefox for Windows. Other operating systems are unaffected. Mozilla developers...

Use-after-free when resizing canvas element during restyling — Mozilla

Mozilla community member Jean-Max Reymond discovered a use-after-free vulnerability with a element on a page. This occurs when a resize event is triggered in concert with style changes but the canvas references have been recreated in the meantime, destroying the originally referenced context. Thi...

Overflow issues in libstagefright — Mozilla

An anonymous researcher reported, via TippingPoint's Zero Day Initiative, two integer overflows in the libstagefright library that could be triggered by a malicious 'saio' chunk in an MPEG4 video. These overflows allowed for potential arbitrary code execution. This issue was independently reporte...

Same origin violation and local file stealing via PDF reader — Mozilla

Security researcher Cody Crews reported on a way to violate the same origin policy and inject script into a non-privileged part of the built-in PDF Viewer. This would allow an attacker to read and steal sensitive local files on the victim's computer...

Buffer overflow when parsing compressed XML — Mozilla

Security researcher Ucha Gobejishvili used the Address Sanitizer tool to find a buffer overflow while parsing compressed XML content. This was due to an error in how buffer space is created and modified when handling large amounts of XML data. This results in a potentially exploitable crash...

Privilege escalation through IPC channel messages — Mozilla

Mozilla Developer Jed Davis and Mozilla security engineer Christoph Diehl reported that Mozilla had inherited a Inter-process Communication IPC vulnerability when IPC was introduced into Mozilla products through third-party code. This could allow for privilege escalation through IPC channels due ...

getUserMedia permission dialog incorrectly displays location — Mozilla

Mozilla engineer Matt Wobensmith discovered that when the getUserMedia permission dialog for an iframe appears in one domain, it will display its origin as that of the top-level document and not the calling framed page. This could lead to users incorrectly giving camera or microphone permissions...

CSS and HTML injection through Style Inspector — Mozilla

Security researcher Mariusz Mlynski reported that when a maliciously crafted stylesheet is inspected in the Style Inspector, HTML and CSS can run in a chrome privileged context without being properly sanitized first. This can lead to arbitrary code execution...

Web console eval capable of executing chrome-privileged code — Mozilla

Security researcher Colby Russell discovered that eval in the web console can execute injected code with chrome privileges, leading to the running of malicious code in a privileged context. This allows for arbitrary code execution through a malicious web page if the web console is invoked by the...

Code execution through javascript: URLs — Mozilla

Mozilla security researcher mozbugra4 reported a arbitrary code execution attack using a javascript: URL. The Gecko engine features a JavaScript sandbox utility that allows the browser or add-ons to safely execute script in the context of a web page. In certain cases, javascript: URLs are execute...

Fixes for potentially exploitable crashes ported to the legacy branch — Mozilla

Mozilla developers took fixes from previously fixed memory safety bugs in newer Mozilla-based products and ported them to the Mozilla 1.8.1 branch so they can be utilized by Thunderbird 2 and SeaMonkey 1.1...

Crashes with evidence of memory corruption (rv:1.9.0.7) — Mozilla

Mozilla developers identified and fixed several stability bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these crashes showed evidence of memory corruption under certain circumstances and we presume that with enough effort at least some of these could be...

Upgrade PNG library to fix memory safety hazards — Mozilla

Google security researcher Tavis Ormandy reported several memory safety hazards to the libpng project, an external library used by Mozilla to render PNG images. These vulnerabilities could be used by a malicious website to crash a victim's browser and potentially execute arbitrary code on their...

Security Vulnerabilities fixed in Thunderbird 78.1 — Mozilla

By observing the stack trace for JavaScript errors in web workers, it was possible to leak the result of a cross-origin redirect. This applied only to content that can be parsed as script. WebRTC used the memory address of a class instance as a connection identifier. Unfortunately, this value is...

Buffer overflow parsing H.264 video with Linux Gstreamer — Mozilla

Security researcher Aki Helin used the Address Sanitizer tool to find a buffer overflow during video playback on Linux systems. This was due to a problem in older versions of the Gstreamer plugin during the parsing of H.264 formatted video. This issue could be used to induce a possibly exploitabl...

Use-after-free vulnerability when viewing XUL document with script disabled — Mozilla

Security researcher Martin Barbella reported that under certain conditions, viewing a XUL document while JavaScript was disabled caused deleted memory to be accessed. This flaw could potentially be used by an attacker to crash a victim's browser and run arbitrary code on their computer...

Same-origin violations in XMLHttpRequest and XPCNativeWrapper.toString — Mozilla

Mozilla security researcher mozbugra4 reported that it is possible to create a document whose URI does not match the document's principal using XMLHttpRequest. This type of mismatch leads to incorrect results in principal-based security checks. An attacker could use this vulnerability to execute...

Security Vulnerabilities fixed in Firefox 136 — Mozilla

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. Android apps can load web pages using the Custom Tabs feature. This feature supports a transition animation that could...

Security Vulnerabilities fixed in Thunderbird 78 — Mozilla

When %2F was present in a manifest URL, Thunderbird's AppCache behavior may have become confused and allowed a manifest to be served from a subdirectory. This could cause the appcache to be used to service requests for the top level directory. A VideoStreamEncoder may have been freed in a race...

Security vulnerabilities fixed in Thunderbird 45.7 — Mozilla

JIT code allocation can allow for a bypass of ASLR and DEP protections leading to potential memory corruption attacks. Use-after-free while manipulating XSL in XSLT documents Hashed codes of JavaScript objects are shared between pages. This allows for pointer leaks because an object’s address can...