Summary
Mozilla Thunderbird is a standalone mail and newsgroup client.
Security Fix(es):
* libexpat: denial of service via crafted XML input (CVE-2026-45186)
* firefox: Mitigation bypass in the Enterprise Policies component (CVE-2026-109764)
* firefox: Spoofing issue in the DOM: Web Serial component (CVE-2026-109770)
* firefox: Mitigation bypass in the File Handling component (CVE-2026-109783)
* firefox: thunderbird: Privilege escalation in the Application Update component (CVE-2026-109704)
* firefox: Use-after-free in the XML component (CVE-2026-109718)
* firefox: Information disclosure in the PDF Viewer component (CVE-2026-109742)
* firefox: Incorrect boundary conditions in the JavaScript Engine component (CVE-2026-109715)
* firefox: firefox: Sandbox escape via incorrect boundary conditions in Win32 widget (CVE-2026-109740)
* firefox: Use-after-free in the Storage: IndexedDB component (CVE-2026-109706)
* firefox: Use-after-free in the Crash Reporting component (CVE-2026-109713)
* firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-109724)
* firefox: Sandbox escape due to uninitialized memory in the DOM: Web Serial component (CVE-2026-109745)
* firefox: Mitigation bypass in the File Handling component (CVE-2026-109782)
* firefox: Information disclosure, privilege escalation in the Security: Process Sandboxing component (CVE-2026-109709)
* firefox: Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component (CVE-2026-109705)
* firefox: Use-after-free in the Audio/Video: Playback component (CVE-2026-109738)
* firefox: Sandbox escape due to race condition in the Networking component (CVE-2026-109757)
* firefox: Use-after-free in the Storage: Bucket File System component (CVE-2026-109741)
* firefox: Use-after-free in the JavaScript Engine: JIT component (CVE-2026-109729)
* firefox: Other issue in the DOM: File component (CVE-2026-109744)
* firefox: Incorrect boundary conditions in the JavaScript Engine component (CVE-2026-109716)
* firefox: Race condition, use-after-free in the Graphics: CanvasWebGL component (CVE-2026-109719)
* firefox: Incorrect boundary conditions in the Layout component (CVE-2026-109753)
* firefox: Integer overflow in the Layout: Text and Fonts component (CVE-2026-109723)
* firefox: Privilege escalation in the DOM: Navigation component (CVE-2026-109756)
* firefox: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-109733)
* firefox: thunderbird: Mitigation bypass in the DOM: Security component (CVE-2026-109734)
* firefox: Mitigation bypass in the File Handling component (CVE-2026-109763)
* firefox: Sandbox escape due to incorrect boundary conditions in the Networking component (CVE-2026-109708)
* firefox: Use-after-free in the DOM: Bindings (WebIDL) component (CVE-2026-109717)
* firefox: Use-after-free in the DOM: Workers component (CVE-2026-109752)
* firefox: Race condition in the XPCOM component (CVE-2026-109776)
* firefox: Sandbox escape due to use-after-free in the Networking component (CVE-2026-109707)
* firefox: Mitigation bypass in the Networking: HTTP component (CVE-2026-109760)
* firefox: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-109720)
* firefox: Information disclosure in the Storage: IndexedDB component (CVE-2026-109777)
* firefox: Use-after-free in the SVG component (CVE-2026-109726)
* firefox: Integer overflow in the Graphics component (CVE-2026-109730)
* firefox: Use-after-free in the Audio/Video component (CVE-2026-109727)
* firefox: Mitigation bypass in the Enterprise Policies component (CVE-2026-109737)
* firefox: Mitigation bypass in the Enterprise Policies component (CVE-2026-109766)
* firefox: Use-after-free in the DOM: Streams component (CVE-2026-109732)
* firefox: Site isolation issue in the Networking component (CVE-2026-109759)
* firefox: Privilege escalation in the WebExtensions component (CVE-2026-109778)
* firefox: Incorrect boundary conditions in the SVG component (CVE-2026-109762)
* firefox: Race condition, use-after-free in the Graphics: Text component (CVE-2026-109765)
* firefox: Incorrect boundary conditions in the DOM: Editor component (CVE-2026-109754)
* firefox: Information disclosure in the Networking component (CVE-2026-109751)
* firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-109725)
* firefox: Sandbox escape due to uninitialized memory in the Graphics component (CVE-2026-109712)
* firefox: Use-after-free in the Graphics: Canvas2D component (CVE-2026-109711)
* firefox: Frame poisoning in the Layout component (CVE-2026-109736)
* firefox: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-109722)
* firefox: Information disclosure in the Networking component (CVE-2026-109767)
* firefox: Denial-of-service in the WebRTC component (CVE-2026-109775)
* firefox: Use-after-free in the DOM: Animation component (CVE-2026-109728)
* firefox: Denial-of-service in the Printing: Output component (CVE-2026-109781)
* firefox: thunderbird: Use-after-free in the Graphics: Text component (CVE-2026-109710)
* firefox: thunderbird: Incorrect boundary conditions in the Graphics: Canvas2D component (CVE-2026-109731)
* firefox: Incorrect boundary conditions in the JavaScript Engine: JIT component (CVE-2026-109721)
* firefox: Privilege escalation in the Panning and Zooming component (CVE-2026-109743)
Bug Fix(es) and Enhancement(s):
* Thunderbird ESR 153 rebase [rhel-9.8.z] (JIRA:RHEL-175199)
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.
Fixed packages 1
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 9 | thunderbird | 153.5.0-1.el9_8.alma.1 |
Vulnerabilities 62
-
Critical 9.6
Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component
Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44.
-
Critical 9.6
Sandbox escape due to use-after-free in the Networking component
Sandbox escape due to use-after-free in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44.
-
Critical 9.6
Sandbox escape due to incorrect boundary conditions in the Networking component
Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44.
-
Critical 9.6
Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component
Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Critical 9.6
Sandbox escape due to uninitialized memory in the DOM: Web Serial component
Sandbox escape due to uninitialized memory in the DOM: Web Serial component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.8
Privilege escalation in the Application Update component
Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.8
Information disclosure, privilege escalation in the Security: Process Sandboxing component
Information disclosure, privilege escalation in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.8
Integer overflow in the Graphics component
Integer overflow in the Graphics component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.8
Privilege escalation in the Panning and Zooming component
Privilege escalation in the Panning and Zooming component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.8
Privilege escalation in the DOM: Navigation component
Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.8
Incorrect boundary conditions in the SVG component
Incorrect boundary conditions in the SVG component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.8
Privilege escalation in the WebExtensions component
Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.3
Sandbox escape due to race condition in the Networking component
Sandbox escape due to race condition in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.3
Mitigation bypass in the File Handling component
Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox ESR 153.5 and Thunderbird 153.5.
-
High 8.3
Mitigation bypass in the File Handling component
Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox ESR 153.5 and Thunderbird 153.5.
-
High 8.1CVE-2026-109715 Public exploit
Incorrect boundary conditions in the JavaScript Engine component
Incorrect boundary conditions in the JavaScript Engine component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.1
Incorrect boundary conditions in the JavaScript Engine component
Incorrect boundary conditions in the JavaScript Engine component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.1CVE-2026-109722 Public exploit
JIT miscompilation in the JavaScript Engine: JIT component
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.1
JIT miscompilation in the JavaScript Engine: JIT component
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.1
Mitigation bypass in the DOM: Security component
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.1
Frame poisoning in the Layout component
Frame poisoning in the Layout component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.45.
-
High 8.1
Mitigation bypass in the Enterprise Policies component
Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.1
Other issue in the DOM: File component
Other issue in the DOM: File component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.1
Incorrect boundary conditions in the Layout component
Incorrect boundary conditions in the Layout component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.1
Incorrect boundary conditions in the DOM: Editor component
Incorrect boundary conditions in the DOM: Editor component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.1
Site isolation issue in the Networking component
Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.1
Mitigation bypass in the Networking: HTTP component
Mitigation bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 8.1
Mitigation bypass in the Enterprise Policies component
Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 7.1
Sandbox escape due to uninitialized memory in the Graphics component
Sandbox escape due to uninitialized memory in the Graphics component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
High 7.1
JIT miscompilation in the JavaScript: WebAssembly component
JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 6.5
Denial-of-service in the WebRTC component
Denial-of-service in the WebRTC component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 6.5
Denial-of-service in the Printing: Output component
Denial-of-service in the Printing: Output component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 6.1
Spoofing issue in the DOM: Web Serial component
Spoofing issue in the DOM: Web Serial component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Use-after-free in the Storage: IndexedDB component
Use-after-free in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Use-after-free in the Graphics: Text component
Use-after-free in the Graphics: Text component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Use-after-free in the Graphics: Canvas2D component
Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Use-after-free in the Crash Reporting component
Use-after-free in the Crash Reporting component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Use-after-free in the DOM: Bindings (WebIDL) component
Use-after-free in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Use-after-free in the XML component
Use-after-free in the XML component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4CVE-2026-109721 Public exploit
Incorrect boundary conditions in the JavaScript Engine: JIT component
Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Integer overflow in the Layout: Text and Fonts component
Integer overflow in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Use-after-free in the DOM: Core & HTML component
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Use-after-free in the DOM: Core & HTML component
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Use-after-free in the SVG component
Use-after-free in the SVG component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Use-after-free in the Audio/Video component
Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Use-after-free in the DOM: Animation component
Use-after-free in the DOM: Animation component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Use-after-free in the JavaScript Engine: JIT component
Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Incorrect boundary conditions in the Graphics: Canvas2D component
Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Use-after-free in the DOM: Streams component
Use-after-free in the DOM: Streams component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Use-after-free in the Audio/Video: Playback component
Use-after-free in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Use-after-free in the Storage: Bucket File System component
Use-after-free in the Storage: Bucket File System component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Use-after-free in the DOM: Workers component
Use-after-free in the DOM: Workers component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Mitigation bypass in the File Handling component
Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 5.4
Mitigation bypass in the Enterprise Policies component
Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 4.3
Information disclosure in the PDF Viewer component
Information disclosure in the PDF Viewer component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 4.3
Information disclosure in the Networking component
Information disclosure in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 4.3
Information disclosure in the Networking component
Information disclosure in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 4.3
Information disclosure in the Storage: IndexedDB component
Information disclosure in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 4.2
Race condition, use-after-free in the Graphics: CanvasWebGL component
Race condition, use-after-free in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 4.2
Race condition, use-after-free in the Graphics: Text component
Race condition, use-after-free in the Graphics: Text component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Medium 4.2
Race condition in the XPCOM component
Race condition in the XPCOM component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
-
Low 2.9
In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service vi…
References
-
report
https://access.redhat.com/security/cve/CVE-2026-109704
-
report
https://access.redhat.com/security/cve/CVE-2026-109705
-
report
https://access.redhat.com/security/cve/CVE-2026-109706
-
report
https://access.redhat.com/security/cve/CVE-2026-109707
-
report
https://access.redhat.com/security/cve/CVE-2026-109708
-
report
https://access.redhat.com/security/cve/CVE-2026-109709
-
report
https://access.redhat.com/security/cve/CVE-2026-109710
-
report
https://access.redhat.com/security/cve/CVE-2026-109711
-
report
https://access.redhat.com/security/cve/CVE-2026-109712
-
report
https://access.redhat.com/security/cve/CVE-2026-109713
-
report
https://access.redhat.com/security/cve/CVE-2026-109715
-
report
https://access.redhat.com/security/cve/CVE-2026-109716
-
report
https://access.redhat.com/security/cve/CVE-2026-109717
-
report
https://access.redhat.com/security/cve/CVE-2026-109718
-
report
https://access.redhat.com/security/cve/CVE-2026-109719
-
report
https://access.redhat.com/security/cve/CVE-2026-109720
-
report
https://access.redhat.com/security/cve/CVE-2026-109721
-
report
https://access.redhat.com/security/cve/CVE-2026-109722
-
report
https://access.redhat.com/security/cve/CVE-2026-109723
-
report
https://access.redhat.com/security/cve/CVE-2026-109724
-
report
https://access.redhat.com/security/cve/CVE-2026-109725
-
report
https://access.redhat.com/security/cve/CVE-2026-109726
-
report
https://access.redhat.com/security/cve/CVE-2026-109727
-
report
https://access.redhat.com/security/cve/CVE-2026-109728
-
report
https://access.redhat.com/security/cve/CVE-2026-109729
-
report
https://access.redhat.com/security/cve/CVE-2026-109730
-
report
https://access.redhat.com/security/cve/CVE-2026-109731
-
report
https://access.redhat.com/security/cve/CVE-2026-109732
-
report
https://access.redhat.com/security/cve/CVE-2026-109733
-
report
https://access.redhat.com/security/cve/CVE-2026-109734
-
report
https://access.redhat.com/security/cve/CVE-2026-109736
-
report
https://access.redhat.com/security/cve/CVE-2026-109737
-
report
https://access.redhat.com/security/cve/CVE-2026-109738
-
report
https://access.redhat.com/security/cve/CVE-2026-109740
-
report
https://access.redhat.com/security/cve/CVE-2026-109741
-
report
https://access.redhat.com/security/cve/CVE-2026-109742
-
report
https://access.redhat.com/security/cve/CVE-2026-109743
-
report
https://access.redhat.com/security/cve/CVE-2026-109744
-
report
https://access.redhat.com/security/cve/CVE-2026-109745