Issued at: 2026-04-28
Updated at: 2026-04-29
Synopsis
Important: firefox security update
Description
Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.
Security Fix(es):
* firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS (CVE-2026-6772)
* firefox: thunderbird: Use-after-free in the JavaScript Engine component (CVE-2026-6754)
* firefox: thunderbird: Spoofing issue in the DOM: Core & HTML component (CVE-2026-6762)
* firefox: thunderbird: Incorrect boundary conditions in the WebRTC component (CVE-2026-6752)
* firefox: thunderbird: Other issue in the Storage: IndexedDB component (CVE-2026-6770)
* firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-6757)
* firefox: thunderbird: Other issue in the Libraries component in NSS (CVE-2026-6767)
* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150 (CVE-2026-6786)
* firefox: thunderbird: Incorrect boundary conditions in the WebRTC component (CVE-2026-6753)
* firefox: thunderbird: Use-after-free in the Widget: Cocoa component (CVE-2026-6759)
* firefox: thunderbird: Use-after-free in the WebRTC component (CVE-2026-6747)
* firefox: thunderbird: Information disclosure due to uninitialized memory in the Graphics: Canvas2D component (CVE-2026-6749)
* firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS (CVE-2026-6766)
* firefox: thunderbird: Privilege escalation in the Networking component (CVE-2026-6761)
* firefox: thunderbird: Mitigation bypass in the File Handling component (CVE-2026-6763)
* firefox: thunderbird: Privilege escalation in the Graphics: WebRender component (CVE-2026-6750)
* firefox: thunderbird: Uninitialized memory in the Audio/Video: Web Codecs component (CVE-2026-6748)
* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150 (CVE-2026-6785)
* firefox: thunderbird: Mitigation bypass in the DOM: Security component (CVE-2026-6771)
* firefox: thunderbird: Incorrect boundary conditions in the DOM: Device Interfaces component (CVE-2026-6764)
* firefox: thunderbird: Information disclosure in the Form Autofill component (CVE-2026-6765)
* firefox: thunderbird: Privilege escalation in the Debugger component (CVE-2026-6769)
* firefox: thunderbird: Uninitialized memory in the Audio/Video: Web Codecs component (CVE-2026-6751)
* firefox: thunderbird: Incorrect boundary conditions in the WebRTC: Networking component (CVE-2026-6776)
* firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-6746)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.