Crashes with evidence of memory corruption (rv:1.9.2.2/ 1.9.1.8/ 1.9.0.18) — 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...

XSS hazard using SVG document and binary Content-Type — Mozilla

Mozilla security researcher Georgi Guninski reported that when a SVG document which is served with Content-Type: application/octet-stream is embedded into another document via an tag with type="image/svg+xml", the Content-Type is ignored and the SVG document is processed normally. A website which...

URL spoofing with box drawing character — Mozilla

Bjoern Hoehrmann and security researcher Moxie Marlinspike independently reported that Unicode box drawing characters were allowed in Internationalized Domain Names IDN where they could be visually confused with punctuation used in valid web addresses. This could be combined with a phishing-type...

Crash with malformed GIF file on Mac OS X — Mozilla

Drew Yao of Apple Product Security reported a vulnerability in Mozilla graphics code which handles GIF rendering in Mac OS X. He demonstrated that a GIF file could be specially crafted to cause the browser to free an uninitialized pointer. An attacker could use this vulnerability to crash the...

Privilege escalation, XSS, Remote Code Execution — Mozilla

Mozilla contributors mozbugra4 and Boris Zbarsky submitted a series of vulnerabilities which allow scripts from page content to escape from its sandboxed context and/or run with chrome privileges. An additional vulnerability reported by mozbugra4 demonstrated that the XMLDocument.load function ca...

URIs with invalid %-encoding mishandled by Windows — Mozilla

On Windows XP with Internet Explorer 7 installed several "web related" URI schemes do not launch the registered protocol-handler if the URI contains an invalid %-encoded sequence. This was initially reported by Billy Rios and Nate McFeters with additional investigation by Secunia. A patch that...

File type confusion due to %00 in name — Mozilla

Ronald van den Heetkamp reported that a filename URL containing %00 encoded null can cause Firefox to interpret the file extension differently than the underlying Windows operating system potentially leading to unsafe actions such as running a program. This is only accessible locally...

UniversalBrowserRead privilege escalation — Mozilla

shutdown reports that scripts granted the UniversalBrowserRead privilege can leverage that into the equivalent of the far more powerful UniversalXPConnect since they are allowed to "read" into a privileged context. This allows the attacker the ability to run scripts with the full privilege of the...

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 Vulnerabilities fixed in Firefox ESR 115.6 — Mozilla

The WebGL DrawElementsInstanced method was susceptible to a heap buffer overflow when used on systems with the Mesa VM driver. This issue could allow an attacker to perform remote code execution and sandbox escape. EncryptingOutputStream was susceptible to exposing uninitialized data. This issue...

Security Vulnerabilities fixed in Thunderbird 91.1 — Mozilla

When delegating navigations to the operating system, Thunderbird 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 Thunderbird for Windows. Other operating systems are unaffected. Mozilla...

Arbitrary file manipulation by local user through Mozilla updater and callback application path parameter — Mozilla

Security researcher Holger Fuhrmannek reported that when the Updater is opened directly using the callback application path parameter, a copy of a user specified file is made as a callback file. If the target of this file is made with a locked hardlink, an arbitrary local file can be replaced on...

Use-after-free in service workers with nested sync events — Mozilla

Security researcher Looben Yang discovered a use-after-free vulnerability when working with nested sync event loops in Service Workers. He discovered a mechanism where scripts can close their own worker, which will then trigger a synchronization XMLHttpRequest on this now closed and released...

Use-after-free in GetStaticInstance in WebRTC — Mozilla

Security researcher Ronald Crane reported a race condition in GetStaticInstance in WebRTC which results in a use-after-free. This could result in a potentially exploitable crash. This issue was found through code inspection and does not have clear mechanism to be exploited through web content but...

Lockscreen passcode bypass due to race condition — Mozilla

Shally Li was first to report a race condition in the lockscreen of Firefox OS that can be used to bypass the passcode lock of a Firefox OS device. Under certain circumstances on a locked device, the user will be dropped directly to the homescreen instead of being presented with the passcode inpu...

Out of bounds read in QCMS library with ICC V4 profile attributes — Mozilla

Security researcher Felix Gröbert of Google discovered an out of bounds read in the QCMS color management library while manipulating an image with specific attributes in its ICC V4 profile. This causes a crash and could lead to information disclosure...

Wifi direct system messages don't require a permission — Mozilla

Paul Theriault of Mozilla discovered a privacy issue with a WiFi-related system message that wasn't properly restricted to apps with the "wifi-manage" permission. As a result, even unprivileged apps could have received those messages, allowing them to extract limited information from a vulnerable...

Same-origin bypass through anchor navigation — Mozilla

Mozilla developer Olli Pettay reported that while investigating Mozilla Foundation Security Advisory 2015-28, he and Mozilla developer Boris Zbarsky found an alternate way to trigger a similar vulnerability. The previously reported flaw used an issue with SVG content navigation to bypass...

crypto.generateCRMFRequest does not validate type of key — Mozilla

Mozilla developer David Keeler reported that the crypto.generateCRFMRequest method did not correctly validate the key type of the KeyParams argument when generating ec-dual-use requests. This could lead to a crash and a denial of service DOS attack...

Uninitialized functions in DOMSVGZoomEvent — Mozilla

Mozilla community member Ms2ger discovered that some DOMSVGZoomEvent functions are used without being properly initialized, causing uninitialized memory to be used when they are called by web content. This could lead to a information leakage to sites depending on the contents of this uninitialize...

Privilege escalation through Mozilla Updater — Mozilla

Security researcher Ash reported an issue with the Mozilla Updater. The Mozilla Updater can be made to load a malicious local DLL file in a privileged context through either the Mozilla Maintenance Service or independently on systems that do not use the service. This occurs when the DLL file is...

Miscellaneous memory safety hazards (rv:2.0.1/ 1.9.2.17/ 1.9.1.19) — 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 error in nsBarProp — Mozilla

Security researcher Sergey Glazunov reported that it was possible to access the locationbar property of a window object after it had been closed. Since the closed window's memory could have been subsequently reused by the system it was possible that an attempt to access the locationbar property...

Cross-origin data leakage from script filename in error messages — Mozilla

Security researcher Soroush Dalili reported that potentially sensitive URL parameters could be leaked across domains upon script errors when the script filename and line number is included in the error message...

Dangling pointer vulnerability in nsPluginArray — Mozilla

Security researcher regenrecht reported via TippingPoint's Zero Day Initiative an error in the implementation of the window.navigator.plugins object. When a page reloads, the plugins array would reallocate all of its members without checking for existing references to each member. This could resu...

SSL tampering via non-200 responses to proxy CONNECT requests — Mozilla

Microsoft security researchers Shuo Chen, Ziqing Mao, Yi-Min Wang, and Ming Zhang reported that when a CONNECT request is sent to a proxy server and a non-200 response is returned, then the body of the response is incorrectly rendered within the context of the request Host: header. An active...

Crash and remote code execution via __proto__ tampering — Mozilla

Mozilla developer Jesse Ruderman demonstrated that by tampering with the window.proto.proto object, one can cause the browser to place a lock on a non-native object, leading to a crash. Although we have not demonstrated such control, a determined attacker might be able to exploit this crash to ru...

Parsing error in E4X default namespace — Mozilla

Security researcher Chris Evans reported an error in the method used to parse the default namespace in an E4X document. The error was caused by quote characters in the namespace not being properly escaped. The severity of this issue was determined to be low...

Privilege escalation via XPCnativeWrapper pollution — Mozilla

Mozilla security researcher mozbugra4 reported a series of vulnerabilities by which page content can pollute XPCNativeWrappers and have arbitrary code run with chrome privileges. One variant reported by mozbugra4 only affected Firefox 2...

nsXMLDocument::OnChannelRedirect() same-origin violation — Mozilla

Mozilla security researcher mozbugra4 reported that the same-origin check in nsXMLDocument::OnChannelRedirect could be bypassed. This vulnerability could be used to execute JavaScript in the context of a different website...

Remote code execution by overflowing CSS reference counter — Mozilla

An anonymous researcher, via TippingPoint's Zero Day Initiative program, reported a vulnerability in Mozilla's internal CSSValue array data structure. The vulnerability was caused by an insufficiently sized variable being used as a reference counter for CSS objects. By creating a very large numbe...

Improvements to help protect against Cross-Site Scripting attacks — Mozilla

Firefox 2.0.0.2 and 1.5.0.10 contain several small changes that will make it easier for sites to protect their visitors against Cross-Site Scripting XSS attacks. Invalid trailing characters in HTML tag attributes The Mozilla parser formerly ignored invalid trailing characters in HTML tag attribut...

Accessing XBL compilation scope via valueOf.call() — Mozilla

mozbugra4 discovered that the compilation scope of privileged built-in XBL bindings was not fully protected from web content and could be accessed by calling valueOf.call and valueOf.apply on a method of that binding. This could then be used to compile and run attacker-supplied JavaScript, giving...

Security Vulnerabilities fixed in Firefox ESR 115.21 — Mozilla

In resizeToAtLeast of SkRegion.cpp, there was a possible out of bounds write due to an integer overflow 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. It was possibl...

Security Vulnerabilities fixed in Focus for iOS 126 — Mozilla

The file scheme of URLs would be hidden, resulting in potential spoofing of a website's address in the location bar...

Security Vulnerabilities fixed in Firefox ESR 102.13 — Mozilla

An attacker could have triggered a use-after-free condition when creating a WebRTC connection over HTTPS. Cross-compartment wrappers wrapping a scripted proxy could have caused objects from other compartments to be stored in the main compartment resulting in a use-after-free. A website could have...

Use-after-free deleting tables from a contenteditable document — Mozilla

Security researcher firehack used the Address Sanitizer tool to discover a use-after-free in contenteditable mode. This occurs when deleting document object model DOM table elements created within the editor and results in a potentially exploitable crash...

HTML injection in homescreen app bypassing DOM sanitizer — Mozilla

Mozilla fixed a bug in the l10n localization of the default homescreen app of Firefox OS reported by security researcher Muneaki Nishimura. Exploiting this issue requires tricking the user into bookmarking a specially crafted web page via the 'Add to home screen' functionality. As a result, an...

Site attribute spoofing on Android by pasting URL with unknown scheme — Mozilla

Security researcher Jordi Chancel reported that on Firefox for Android, when a URL is pasted with an unknown protocol, such as secure: or httpz:, the pasted URL is shown in the addressbar but no navigation occurs. Other addressbar attributes present before this pasted URL is entered will continue...

URL spoofing in reader mode — Mozilla

Security researcher Juho Nurminen reported a mechanism to spoof the URL displayed in the addressbar in reader mode by manipulating the loaded URL. This flaw allows for the URL displayed to be different than that the web content rendered. This allows for potential spoofing but the effects are...

Accessing cross-origin objects via the Alarms API — Mozilla

Mozilla developer Boris Zbarsky reported that a malicious app could use the AlarmAPI to read the values of cross-origin references, such as an iframe's location object, as part of an alarm's JSON data. This allows a malicious app to bypass same-origin policy...

Integer overflow in ANGLE library — Mozilla

Security researcher Alex Chapman reported that the Almost Native Graphics Layer Engine ANGLE library used by Mozilla is vulnerable to an integer overflow. This vulnerability is present because of insufficient bounds checking in the drawLineLoop function, which can be driven by web content to...

Wrong principal used for validating URI for some Javascript components — Mozilla

Security researcher Cody Crews reported that some Javascript components will perform checks against the wrong uniform resource identifier URI before performing security sensitive actions. This will return an incorrect location for the originator of the call. This could be used to bypass same-orig...

Memory corruption while rendering grayscale PNG images — Mozilla

Mozilla community member Tobias Schula reported that if gfx.colormanagement.enablev4 preference is enabled manually in about:config, some grayscale PNG images will be rendered incorrectly and cause memory corruption during PNG decoding when certain color profiles are in use. A crafted PNG image...

Web content bypass of COW and SOW security wrappers — Mozilla

Mozilla developer Bobby Holley discovered that it was possible to bypass some protections in Chrome Object Wrappers COW and System Only Wrappers SOW, making their prototypes mutable by web content. This could be used leak information from chrome objects and possibly allow for arbitrary code...

Use-after-free in shlwapi.dll — Mozilla

Security researchers Blair Strang and Scott Bell of Security Assessment found that when a parent window spawns and closes a child window that uses the file open dialog, a crash can be induced in shlwapi.dll on 32-bit Windows 7 systems. This crash may be potentially exploitable...

Integer underflow when using JavaScript RegExp — Mozilla

Mark Kaplan reported a potentially exploitable crash due to integer underflow when using a large JavaScript RegExp expression. We would also like to thank Mark for contributing the fix for this problem...

Dangling pointer vulnerability in nsTreeContentView — Mozilla

Security researcher regenrecht reported via TippingPoint's Zero Day Initiative that the implementation of XUL 's content view contains a dangling pointer vulnerability. One of the content view's methods for accessing the internal structure of the tree could be manipulated into removing a node pri...

Dangling pointer vulnerability using DOM plugin array — Mozilla

Security researcher Sergey Glazunov reported a dangling pointer vulnerability in the implementation of navigator.plugins in which the navigator object could retain a pointer to the plugins array even after it had been destroyed. An attacker could potentially use this issue to crash the browser an...

Frameset integer overflow vulnerability — Mozilla

Security researcher Chris Rohlf of Matasano Security reported that the implementation of the HTML frameset element contained an integer overflow vulnerability. The code responsible for parsing the frameset columns used an 8-byte counter for the column numbers, so when a very large number of colum...