Executive brief
A security vulnerability has been identified in the Mozilla Firefox web browser's DOM Bindings component, which handles how the browser interacts with web page content. An attacker could potentially exploit this flaw to cause the browser to crash or execute unauthorized actions by manipulating memory pointers. This could lead to a compromise of the user's browsing session or the underlying system.
Technical details
An invalid pointer vulnerability exists in the DOM: Bindings (WebIDL) component of Mozilla Firefox. The flaw is triggered during the processing of WebIDL bindings, which serve as the interface between the browser's internal C++ implementation and JavaScript. While specific exploitation details are restricted in the associated Bugzilla report (Bug 2049523), invalid pointer vulnerabilities typically allow for memory corruption, which can be leveraged for arbitrary code execution or sandbox escapes. The vulnerability is reachable via malicious web content and has been addressed in Firefox 153, Firefox ESR 115.38, and Firefox ESR 140.13.
Affected products
- Mozilla Firefox < 153
- Mozilla Firefox ESR < 115.38, < 140.13
Timeline
- 2026-07-21: disclosed
- 2026-07-21: patched