Red Hat Security Advisory: firefox security update
Multiple security vulnerabilities affecting Mozilla Firefox and Thunderbird have been addressed in a Red Hat security update. These include denial-of-service due to out-of-memory in the WebRender graphics component, sandbox escape via an invalid pointer in the GMP audio/video component, same-origin policy bypass in the Canvas2D graphics component, uninitialized memory in the JavaScript engine, and various memory safety bugs. The update applies to Red Hat Enterprise Linux 9.0 variants and includes fixes in Firefox ESR and Thunderbird ESR versions. The vulnerabilities have been rated with high severity by Red Hat Product Security.
AI Analysis
Technical Summary
This Red Hat security advisory addresses five vulnerabilities in Mozilla Firefox and Thunderbird components. CVE-2025-9182 is a denial-of-service vulnerability caused by out-of-memory conditions in the Graphics: WebRender component. CVE-2025-9179 is a sandbox escape vulnerability due to an invalid pointer in the Audio/Video: GMP component. CVE-2025-9180 involves a same-origin policy bypass in the Graphics: Canvas2D component. CVE-2025-9181 concerns uninitialized memory usage in the JavaScript engine. CVE-2025-9185 covers multiple memory safety bugs fixed in Firefox ESR 115.27, 128.14, 140.2 and Thunderbird ESR 128.14, 140.2, as well as Firefox 142 and Thunderbird 142. The advisory provides updated Firefox packages for Red Hat Enterprise Linux 9.0 on multiple architectures. No CVSS scores are provided in the advisory, but the issues are rated as important/high severity by Red Hat. No known exploits in the wild have been reported. The advisory references official Red Hat errata and update articles for patch application.
Potential Impact
Successful exploitation of these vulnerabilities could lead to denial-of-service conditions, sandbox escapes, bypass of same-origin policy protections, exposure of uninitialized memory, and other memory safety issues. These impact the confidentiality, integrity, and availability of the affected Firefox and Thunderbird applications. The vulnerabilities affect core browser components responsible for rendering graphics, handling audio/video, enforcing security policies, and executing JavaScript. The memory safety bugs fixed reduce the risk of crashes and potential exploitation. The overall impact is rated as high severity by Red Hat Product Security.
Mitigation Recommendations
Red Hat has released updated Firefox packages that address these vulnerabilities for Red Hat Enterprise Linux 9.0 on multiple architectures (ppc64le, x86_64, aarch64, s390x). Users should apply the security update as detailed in the Red Hat advisory RHSA-2025:15420 and the referenced article https://access.redhat.com/articles/11258. Applying these official patches is the recommended remediation. No additional vendor mitigation guidance or temporary workarounds are provided or required.
Red Hat Security Advisory: firefox security update
Description
Multiple security vulnerabilities affecting Mozilla Firefox and Thunderbird have been addressed in a Red Hat security update. These include denial-of-service due to out-of-memory in the WebRender graphics component, sandbox escape via an invalid pointer in the GMP audio/video component, same-origin policy bypass in the Canvas2D graphics component, uninitialized memory in the JavaScript engine, and various memory safety bugs. The update applies to Red Hat Enterprise Linux 9.0 variants and includes fixes in Firefox ESR and Thunderbird ESR versions. The vulnerabilities have been rated with high severity by Red Hat Product Security.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This Red Hat security advisory addresses five vulnerabilities in Mozilla Firefox and Thunderbird components. CVE-2025-9182 is a denial-of-service vulnerability caused by out-of-memory conditions in the Graphics: WebRender component. CVE-2025-9179 is a sandbox escape vulnerability due to an invalid pointer in the Audio/Video: GMP component. CVE-2025-9180 involves a same-origin policy bypass in the Graphics: Canvas2D component. CVE-2025-9181 concerns uninitialized memory usage in the JavaScript engine. CVE-2025-9185 covers multiple memory safety bugs fixed in Firefox ESR 115.27, 128.14, 140.2 and Thunderbird ESR 128.14, 140.2, as well as Firefox 142 and Thunderbird 142. The advisory provides updated Firefox packages for Red Hat Enterprise Linux 9.0 on multiple architectures. No CVSS scores are provided in the advisory, but the issues are rated as important/high severity by Red Hat. No known exploits in the wild have been reported. The advisory references official Red Hat errata and update articles for patch application.
Potential Impact
Successful exploitation of these vulnerabilities could lead to denial-of-service conditions, sandbox escapes, bypass of same-origin policy protections, exposure of uninitialized memory, and other memory safety issues. These impact the confidentiality, integrity, and availability of the affected Firefox and Thunderbird applications. The vulnerabilities affect core browser components responsible for rendering graphics, handling audio/video, enforcing security policies, and executing JavaScript. The memory safety bugs fixed reduce the risk of crashes and potential exploitation. The overall impact is rated as high severity by Red Hat Product Security.
Mitigation Recommendations
Red Hat has released updated Firefox packages that address these vulnerabilities for Red Hat Enterprise Linux 9.0 on multiple architectures (ppc64le, x86_64, aarch64, s390x). Users should apply the security update as detailed in the Red Hat advisory RHSA-2025:15420 and the referenced article https://access.redhat.com/articles/11258. Applying these official patches is the recommended remediation. No additional vendor mitigation guidance or temporary workarounds are provided or required.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2025:15420
- Cve Count
- 5
- Additional Cves
- ["CVE-2025-9180","CVE-2025-9181","CVE-2025-9182","CVE-2025-9185"]
- Cvss Version
- null
Threat ID: 6a3cc29a4853345fc16d2819
Added to database: 06/25/2026, 05:54:34 UTC
Last enriched: 06/25/2026, 06:19:58 UTC
Last updated: 06/25/2026, 13:00:48 UTC
Views: 2
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