firefox-140.9.0-1.el8_10.ML.1

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.

Security Fix(es):

* firefox: thunderbird: Use-after-free in the JavaScript Engine component (CVE-2026-4701)
* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 (CVE-2026-4721)
* firefox: thunderbird: Privilege escalation in the Netmonitor component (CVE-2026-4717)
* firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-4688)
* firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4706)
* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-4695)
* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component (CVE-2026-4689)
* firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-4698)
* firefox: thunderbird: Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component (CVE-2026-4716)
* firefox: thunderbird: Race condition, use-after-free in the Graphics: WebRender component (CVE-2026-4684)
* firefox: thunderbird: Undefined behavior in the WebRTC: Signaling component (CVE-2026-4705)
* firefox: thunderbird: Uninitialized memory in the Graphics: Canvas2D component (CVE-2026-4715)
* firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4685)
* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video component (CVE-2026-4714)
* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-4709)
* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video component (CVE-2026-4710)
* firefox: thunderbird: Information disclosure in the Widget: Cocoa component (CVE-2026-4712)
* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-4697)
* firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-4713)
* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component (CVE-2026-4690)
* firefox: thunderbird: Use-after-free in the Widget: Cocoa component (CVE-2026-4711)
* firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4686)
* firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-4708)
* firefox: thunderbird: Use-after-free in the CSS Parsing and Computation component (CVE-2026-4691)
* firefox: thunderbird: Incorrect boundary conditions in the Layout: Text and Fonts component (CVE-2026-4699)
* firefox: thunderbird: Use-after-free in the Layout: Text and Fonts component (CVE-2026-4696)
* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component (CVE-2026-4693)
* firefox: thunderbird: Undefined behavior in the WebRTC: Signaling component (CVE-2026-4718)
* firefox: thunderbird: JIT miscompilation in the JavaScript Engine component (CVE-2026-4702)
* firefox: thunderbird: Incorrect boundary conditions in the Graphics: Text component (CVE-2026-4719)
* firefox: thunderbird: Incorrect boundary conditions, integer overflow in the Graphics component (CVE-2026-4694)
* firefox: thunderbird: Sandbox escape in the Responsive Design Mode component (CVE-2026-4692)
* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 (CVE-2026-4720)
* firefox: thunderbird: Mitigation bypass in the Networking: HTTP component (CVE-2026-4700)
* firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-4707)
* firefox: thunderbird: Denial-of-service in the WebRTC: Signaling component (CVE-2026-4704)
* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Telemetry component (CVE-2026-4687)

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.

CVE-2026-4684
Race condition, use-after-free in the Graphics: WebRender component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4685
Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4686
Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4687
Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4688
Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4689
Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4690
Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4691
Use-after-free in the CSS Parsing and Computation component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4692
Sandbox escape in the Responsive Design Mode component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4693
Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4694
Incorrect boundary conditions, integer overflow in the Graphics component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4695
Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4696
Use-after-free in the Layout: Text and Fonts component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4697
Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4698
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4699
Incorrect boundary conditions in the Layout: Text and Fonts component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4700
Mitigation bypass in the Networking: HTTP component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4701
Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4702
JIT miscompilation in the JavaScript Engine component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4704
Denial-of-service in the WebRTC: Signaling component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4705
Undefined behavior in the WebRTC: Signaling component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4706
Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4707
Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4708
Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4709
Incorrect boundary conditions in the Audio/Video: GMP component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4710
Incorrect boundary conditions in the Audio/Video component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4711
Use-after-free in the Widget: Cocoa component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4712
Information disclosure in the Widget: Cocoa component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4713
Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4714
Incorrect boundary conditions in the Audio/Video component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4715
Uninitialized memory in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4716
Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4717
Privilege escalation in the Netmonitor component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4718
Undefined behavior in the WebRTC: Signaling component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4719
Incorrect boundary conditions in the Graphics: Text component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4720
Memory safety bugs present in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. 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. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
CVE-2026-4721
Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. 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. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.