Summary
Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.
Security Fix(es):
* libaom: libaom: heap buffer overflow in AV1 encoder first-pass stats buffer via LAP mode (CVE-2026-56208)
* firefox: thunderbird: Site isolation issue in the DOM: Navigation component (CVE-2026-15719)
* firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-15718)
* firefox: thunderbird: Mitigation bypass in the Enterprise Policies component (CVE-2026-16390)
* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: cubeb component (CVE-2026-16350)
* firefox: thunderbird: Information disclosure in the Storage: IndexedDB component (CVE-2026-16391)
* firefox: thunderbird: Site isolation issue in the Networking: HTTP component (CVE-2026-16375)
* firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-16356)
* firefox: thunderbird: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-16363)
* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.13 and Firefox 153 (CVE-2026-16412)
* firefox: thunderbird: Same-origin policy bypass in the Networking: DNS component (CVE-2026-16381)
* firefox: thunderbird: JIT miscompilation in the JavaScript Engine: JIT component (CVE-2026-16355)
* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38 and Firefox ESR 140.13 (CVE-2026-16361)
* firefox: thunderbird: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-16352)
* firefox: thunderbird: Incorrect boundary conditions in the JavaScript: WebAssembly component (CVE-2026-16368)
* firefox: thunderbird: Mitigation bypass in the PDF Viewer component (CVE-2026-16377)
* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.38, Firefox ESR 140.13 and Firefox 153 (CVE-2026-16360)
* firefox: thunderbird: Use-after-free in the WebRTC: Audio/Video component (CVE-2026-16362)
* firefox: thunderbird: Site isolation issue in the Graphics: WebRender component (CVE-2026-16358)
* firefox: thunderbird: Site isolation issue in the Networking component (CVE-2026-16387)
* firefox: thunderbird: Same-origin policy bypass in the DOM: Navigation component (CVE-2026-16349)
* firefox: thunderbird: Incorrect boundary conditions in the Graphics component (CVE-2026-16357)
* firefox: thunderbird: Sandbox escape due to use-after-free in the DOM: Navigation component (CVE-2026-16351)
* firefox: thunderbird: Privilege escalation in the DOM: Navigation component (CVE-2026-16371)
* firefox: thunderbird: Privilege escalation in the DOM: Content Processes component (CVE-2026-16379)
* firefox: thunderbird: Information disclosure in the Graphics: ImageLib component (CVE-2026-16354)
* firefox: thunderbird: Information disclosure in the Framework component in DevTools (CVE-2026-16374)
* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: GMP component (CVE-2026-16359)
* firefox: thunderbird: Mitigation bypass in the DOM: Networking component (CVE-2026-16383)
* firefox: thunderbird: Integer overflow in the JavaScript: WebAssembly component (CVE-2026-16369)
* firefox: thunderbird: Invalid pointer in the DOM: Bindings (WebIDL) component (CVE-2026-16353)
* firefox: thunderbird: Privilege escalation in WebExtensions (CVE-2026-16396)
* firefox: thunderbird: Information disclosure in the Networking: WebSockets component (CVE-2026-16405)
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 2
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 9 | firefox | 140.13.0-1.el9_8.alma.1 |
| AlmaLinux · 9 | firefox-x11 | 140.13.0-1.el9_8.alma.1 |
Vulnerabilities 33
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Critical 9.8
Same-origin policy bypass in the DOM: Navigation component
Same-origin policy bypass in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Critical 9.8
Incorrect boundary conditions in the Audio/Video: cubeb component
Incorrect boundary conditions in the Audio/Video: cubeb component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Critical 9.8
Sandbox escape due to use-after-free in the DOM: Navigation component
Sandbox escape due to use-after-free in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Critical 9.8
Sandbox escape due to use-after-free in the Disability Access APIs component
Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Critical 9.8
Invalid pointer in the DOM: Bindings (WebIDL) component
Invalid pointer in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Critical 9.8
JIT miscompilation in the JavaScript Engine: JIT component
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Critical 9.8
Sandbox escape due to use-after-free in the Disability Access APIs component
Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Critical 9.8
Incorrect boundary conditions in the Graphics component
Incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Critical 9.8
Site isolation issue in the Graphics: WebRender component
Site isolation issue in the Graphics: WebRender component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Critical 9.8
Memory safety bugs fixed in Thunderbird ESR 140.13 and Thunderbird 153
Memory safety bugs present in Thunderbird ESR 140.12 and Thunderbird 152. 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 was fixe…
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Critical 9.8
Memory safety bugs fixed in Thunderbird ESR 140.13
Memory safety bugs present in Thunderbird ESR 140.12. 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 was fixed in Firefox ESR 115…
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Critical 9.8
JIT miscompilation in the JavaScript: WebAssembly component
JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Critical 9.8
Incorrect boundary conditions in the JavaScript: WebAssembly component
Incorrect boundary conditions in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Critical 9.8
Integer overflow in the JavaScript: WebAssembly component
Integer overflow in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Critical 9.8
Site isolation issue in the Networking: HTTP component
Site isolation issue in the Networking: HTTP component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Critical 9.8
Mitigation bypass in the PDF Viewer component
Mitigation bypass in the PDF Viewer component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Critical 9.8
Mitigation bypass in the DOM: Networking component
Mitigation bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Critical 9.8
Site isolation issue in the Networking component
Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Critical 9.8
Memory safety bugs fixed in Thunderbird ESR 140.13 and Thunderbird 153
Memory safety bugs present in Thunderbird ESR 140.12 and Thunderbird 152. 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 was fixe…
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Critical 9.1
Incorrect boundary conditions in the Audio/Video: GMP component
Incorrect boundary conditions in the Audio/Video: GMP component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Critical 9.1
Same-origin policy bypass in the Networking: DNS component
Same-origin policy bypass in the Networking: DNS component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Critical 9.1
Mitigation bypass in the Enterprise Policies component
Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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High 8.8
Use-after-free in the WebRTC: Audio/Video component
Use-after-free in the WebRTC: Audio/Video component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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High 8.8
Privilege escalation in the DOM: Navigation component
Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, Thunderbird 140.13, Firefox ESR 140.15, and Thunderbird 140.15.
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High 8.8
Privilege escalation in the DOM: Content Processes component
Privilege escalation in the DOM: Content Processes component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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High 8.8
Privilege escalation in WebExtensions
Privilege escalation in WebExtensions. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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High 7.6
Libaom: libaom: heap buffer overflow in av1 encoder first-pass stats buffer via lap mode
A heap buffer overflow vulnerability was found in libaom, the reference AV1 codec implementation. A flaw in the AV1 encoder's Look-Ahead Processing (LAP) mode causes the first-pass stats ring buffer wrap-around guard to be bypassed when g_lag_in_frames is set…
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High 7.5
Information disclosure in the Graphics: ImageLib component
Information disclosure in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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High 7.5
Information disclosure in the Framework component in DevTools
Information disclosure in the Framework component in DevTools. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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High 7.5
Information disclosure in the Storage: IndexedDB component
Information disclosure in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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High 7.5
Information disclosure in the Networking: WebSockets component
Information disclosure in the Networking: WebSockets component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
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Medium 5.4
Site isolation issue in the DOM: Navigation component
We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw. This vulnerability was fixed in Firefox 152.0.6, Firefox ESR 115.38, Firefox ESR 140.13, and Thunderbird 140.13.
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Medium 4.3CVE-2026-15718 Public exploit
Invalid pointer in the JavaScript: WebAssembly component
We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw. This vulnerability was fixed in Firefox 152.0.6, Firefox ESR 140.13, and Thunderbird 140.13.
References
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report
https://access.redhat.com/security/cve/CVE-2026-15718
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report
https://access.redhat.com/security/cve/CVE-2026-15719
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report
https://access.redhat.com/security/cve/CVE-2026-16349
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report
https://access.redhat.com/security/cve/CVE-2026-16350
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report
https://access.redhat.com/security/cve/CVE-2026-16351
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report
https://access.redhat.com/security/cve/CVE-2026-16352
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report
https://access.redhat.com/security/cve/CVE-2026-16353
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report
https://access.redhat.com/security/cve/CVE-2026-16354
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report
https://access.redhat.com/security/cve/CVE-2026-16355
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report
https://access.redhat.com/security/cve/CVE-2026-16356
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report
https://access.redhat.com/security/cve/CVE-2026-16357
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report
https://access.redhat.com/security/cve/CVE-2026-16358
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report
https://access.redhat.com/security/cve/CVE-2026-16359
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report
https://access.redhat.com/security/cve/CVE-2026-16360
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report
https://access.redhat.com/security/cve/CVE-2026-16361
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report
https://access.redhat.com/security/cve/CVE-2026-16362
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report
https://access.redhat.com/security/cve/CVE-2026-16363
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report
https://access.redhat.com/security/cve/CVE-2026-16368
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report
https://access.redhat.com/security/cve/CVE-2026-16369
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report
https://access.redhat.com/security/cve/CVE-2026-16371
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report
https://access.redhat.com/security/cve/CVE-2026-16374
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report
https://access.redhat.com/security/cve/CVE-2026-16375
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report
https://access.redhat.com/security/cve/CVE-2026-16377
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report
https://access.redhat.com/security/cve/CVE-2026-16379
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report
https://access.redhat.com/security/cve/CVE-2026-16381
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report
https://access.redhat.com/security/cve/CVE-2026-16383
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report
https://access.redhat.com/security/cve/CVE-2026-16387
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report
https://access.redhat.com/security/cve/CVE-2026-16390
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report
https://access.redhat.com/security/cve/CVE-2026-16391
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report
https://access.redhat.com/security/cve/CVE-2026-16396
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report
https://access.redhat.com/security/cve/CVE-2026-16405
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report
https://access.redhat.com/security/cve/CVE-2026-16412
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report
https://access.redhat.com/security/cve/CVE-2026-56208
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report
https://bugzilla.redhat.com/2490799
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report
https://bugzilla.redhat.com/2499973
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report
https://bugzilla.redhat.com/2499974
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report
https://bugzilla.redhat.com/2503415
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report
https://bugzilla.redhat.com/2503416
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report
https://bugzilla.redhat.com/2503420