Summary
Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.
Security Fix(es):
* firefox: thunderbird: Sandbox escape due to use-after-free in the Graphics: Canvas2D component (CVE-2025-10527)
* firefox: thunderbird: Incorrect boundary conditions in the JavaScript: GC component (CVE-2025-10532)
* firefox: thunderbird: Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component (CVE-2025-10528)
* firefox: thunderbird: Same-origin policy bypass in the Layout component (CVE-2025-10529)
* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.3, Thunderbird ESR 140.3, Firefox 143 and Thunderbird 143 (CVE-2025-10537)
* firefox: thunderbird: Information disclosure in the Networking: Cache component (CVE-2025-10536)
* firefox: thunderbird: Integer overflow in the SVG component (CVE-2025-10533)
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 | 140.3.0-1.el9_6.alma.1 |
| AlmaLinux · 9 | firefox-x11 | 140.3.0-1.el9_6.alma.1 |
Vulnerabilities 7
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High 8.8
Integer overflow in the SVG component
Integer overflow in the SVG component. This vulnerability was fixed in Firefox 143, Firefox ESR 115.28, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.
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High 8.8
Memory safety bugs fixed in Firefox ESR 140.3, Thunderbird ESR 140.3, Firefox 143 and Thunderbird 143
Memory safety bugs present in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142. 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 co…
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High 7.3
Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component
Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.
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High 7.1
Sandbox escape due to use-after-free in the Graphics: Canvas2D component
Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.
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Medium 6.5
Same-origin policy bypass in the Layout component
Same-origin policy bypass in the Layout component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.
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Medium 6.5
Incorrect boundary conditions in the JavaScript: GC component
Incorrect boundary conditions in the JavaScript: GC component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.
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Medium 6.2
Information disclosure in the Networking: Cache component
Information disclosure in the Networking: Cache component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.
References
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report
https://access.redhat.com/security/cve/CVE-2025-10527
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report
https://access.redhat.com/security/cve/CVE-2025-10528
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report
https://access.redhat.com/security/cve/CVE-2025-10529
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report
https://access.redhat.com/security/cve/CVE-2025-10532
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report
https://access.redhat.com/security/cve/CVE-2025-10533
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report
https://access.redhat.com/security/cve/CVE-2025-10536
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report
https://access.redhat.com/security/cve/CVE-2025-10537
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report
https://bugzilla.redhat.com/2395745
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report
https://bugzilla.redhat.com/2395754
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report
https://bugzilla.redhat.com/2395755
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report
https://bugzilla.redhat.com/2395756
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report
https://bugzilla.redhat.com/2395759
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report
https://bugzilla.redhat.com/2395764
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report
https://bugzilla.redhat.com/2395766
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advisory
https://errata.almalinux.org/9/ALSA-2025-16108.html