A use-after-free vulnerability can occur when working with XMLHttpRequest (XHR) in an event loop, causing the XHR main thread to be called after it has been freed

A use-after-free vulnerability can occur when the SMIL animation controller incorrectly registers with the refresh driver twice when only a single registration is expected

A vulnerability where type-confusion in the IonMonkey just-in-time (JIT) compiler could potentially be used by malicious JavaScript to trigger a potentially exploitable crash

A vulnerability was discovered where specific command line arguments are not properly discarded during Firefox invocation as a shell handler for URLs

The IonMonkey just-in-time (JIT) compiler can leak an internal JS_OPTIMIZED_OUT magic value to the running script during a bailout

The type inference system allows the compilation of functions that can cause type confusions between arbitrary objects when compiled through the IonMonkey just-in-time (JIT)…

A use-after-free vulnerability can occur when a raw pointer to a DOM element on a page is obtained using JavaScript and the element is then removed while still in use

Mozilla developers and community members reported memory safety bugs present in Firefox 65, Firefox ESR 60.5, and Thunderbird 60.5

A use-after-free vulnerability can occur while playing a sound notification in Thunderbird

Mozilla developers and community members reported memory safety bugs present in Firefox 63 and Firefox ESR 60.3

A use-after-free vulnerability can occur after deleting a selection element due to a weak reference to the select element in the options collection

A buffer overflow can occur in the Skia library during buffer offset calculations with hardware accelerated canvas 2D actions due to the use of 32-bit calculations instead of…

When manipulating user events in nested loops while opening a document through script, it is possible to trigger a potentially exploitable crash due to poor event handling

A potential vulnerability leading to an integer overflow can occur during buffer size calculations for images when a raw value is used instead of the checked value

Mozilla developers and community members reported memory safety bugs present in Firefox 62 and Firefox ESR 60.2

A use-after-free vulnerability can occur while parsing an HTML5 stream in concert with custom HTML elements

Mozilla developers and community members reported memory safety bugs present in Firefox 64 and Firefox ESR 60.4

Memory safety bugs present in Firefox 60, Firefox ESR 60, and Firefox ESR 52.8

Memory safety bugs present in Firefox 60 and Firefox ESR 60

A vulnerability can occur when capturing a media stream when the media source type is changed as the capture is occurring

A use-after-free vulnerability can occur when an IndexedDB index is deleted while still in use by JavaScript code that is providing payload values to be stored

A use-after-free vulnerability can occur when refresh driver timers are refreshed in some circumstances during shutdown when the timer is deleted while still in use

Memory safety bugs present in Firefox 61 and Firefox ESR 60.1

Mozilla developers backported selected changes in the Skia library

An integer overflow can occur in the Skia library due to 32-bit integer use in an array without integer overflow checks, resulting in possible out-of-bounds writes

A use-after-free vulnerability can occur while adjusting layout during SVG animations with text paths

A use-after-free vulnerability can occur while enumerating attributes during SVG animations with clip paths

Memory safety bugs were reported in Firefox 59, Firefox ESR 52.7, and Thunderbird 52.7

Memory safety bugs were reported in Firefox ESR 52.6

A use-after-free vulnerability can occur during font face manipulation when a font face is freed while still in use, resulting in a potentially exploitable crash

A use-after-free vulnerability can occur during mouse event handling due to issues with multiprocess support

A use-after-free vulnerability can occur when manipulating HTML media elements with media streams, resulting in a potentially exploitable crash

A use-after-free vulnerability can occur when the widget listener is holding strong references to browser objects that have previously been freed, resulting in a potentially…

A use-after-free vulnerability can occur when form input elements, focus, and selections are manipulated by script content

A use-after-free vulnerability can occur during XSL transformations when the source document for the transformation is manipulated by script content during the transformation

A use-after-free vulnerability can occur while editing events in form elements on a page, resulting in a potentially exploitable crash

An integer overflow vulnerability in the Skia library when allocating memory for edge builders on some systems with at least 8 GB of RAM

Memory safety bugs were reported in Firefox 57 and Firefox ESR 52.5

A use-after-free vulnerability can occur when flushing and resizing layout because the "PressShell" object has been freed while still in use

Memory safety bugs were reported in Firefox 56 and Firefox ESR 52.4

A buffer overflow occurs when drawing and validating elements with the ANGLE graphics library, used for WebGL content

A use-after-free vulnerability can occur in design mode when image objects are resized if objects referenced during the resizing have been freed from memory

A use-after-free vulnerability can occur when manipulating arrays of Accessible Rich Internet Applications (ARIA) elements within containers through the DOM

Memory safety bugs were reported in Firefox 55 and Firefox ESR 52.3

A use-after-free vulnerability can occur when an editor DOM node is deleted prematurely during tree traversal while still bound to the document

A use-after-free vulnerability can occur when manipulating the DOM during the resize event of an image element

A use-after-free vulnerability can occur while re-computing layout for a "marquee" element during window resizing where the updated style object is freed while still in use

A use-after-free vulnerability can occur in WebSockets when the object holding the connection is freed before the disconnection operation is finished

A use-after-free vulnerability can occur in the Fetch API when the worker or the associated window are freed when still in use, resulting in a potentially exploitable crash

A buffer overflow will occur when viewing a certificate in the certificate manager if the certificate has an extremely long object identifier (OID)