Red Hat Security Advisory: firefox security update
Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. Security Fix(es): * firefox: thunderbird: Large branch table could lead to truncated instruction (CVE-2025-8028) * firefox: thunderbird: Memory safety bugs (CVE-2025-8035) * firefox: thunderbird: Incorrect URL stripping in CSP reports (CVE-2025-8031) * firefox: thunderbird: JavaScript engine only wrote partial return value to stack (CVE-2025-8027) * firefox: thunderbird: Potential user-assisted code execution in ?Copy as cURL? command (CVE-2025-8030) * firefox: Memory safety bugs (CVE-2025-8034) * firefox: thunderbird: Incorrect JavaScript state machine for generators (CVE-2025-8033) * firefox: thunderbird: XSLT documents could bypass CSP (CVE-2025-8032) * firefox: thunderbird: javascript: URLs executed on object and embed tags (CVE-2025-8029) 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.
AI Analysis
Technical Summary
Red Hat Product Security issued an important security advisory (RHSA-2025:11748) for Mozilla Firefox and Thunderbird packages on Red Hat Enterprise Linux 9 and its extended update support versions. The advisory addresses nine vulnerabilities (CVE-2025-8027, CVE-2025-8028, CVE-2025-8029, CVE-2025-8030, CVE-2025-8031, CVE-2025-8032, CVE-2025-8033, CVE-2025-8034, CVE-2025-8035) including memory safety bugs, incorrect URL stripping in CSP reports, partial return value writes in the JavaScript engine, potential user-assisted code execution via the 'Copy as cURL' command, CSP bypass via XSLT documents, and execution of javascript: URLs in object/embed tags. These vulnerabilities collectively impact the security posture of Firefox and Thunderbird on affected Red Hat Enterprise Linux 9 platforms. The advisory references fixes available in updated Firefox packages (version 128.13.0-1.el9_6) for multiple architectures and support variants.
Potential Impact
The vulnerabilities include memory safety bugs that could lead to crashes or potentially exploitable conditions, incorrect handling of URLs in CSP reports that might weaken security policies, partial writes in the JavaScript engine that could cause unpredictable behavior, and a user-assisted code execution vector via the 'Copy as cURL' feature. Additionally, CSP bypass via XSLT documents and execution of javascript: URLs in object/embed tags could allow malicious content to execute in contexts where it should be restricted. These issues collectively pose a high security risk by potentially enabling code execution, policy bypass, or memory corruption.
Mitigation Recommendations
Red Hat has released updated Firefox packages addressing these vulnerabilities. Users and administrators should apply the security update as detailed in the Red Hat advisory RHSA-2025:11748 and the referenced article https://access.redhat.com/articles/11258. The update is available for Red Hat Enterprise Linux 9 and its extended update support versions across multiple architectures. Applying these official patches is the recommended remediation. Patch status is confirmed by the vendor advisory.
Red Hat Security Advisory: firefox security update
Description
Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. Security Fix(es): * firefox: thunderbird: Large branch table could lead to truncated instruction (CVE-2025-8028) * firefox: thunderbird: Memory safety bugs (CVE-2025-8035) * firefox: thunderbird: Incorrect URL stripping in CSP reports (CVE-2025-8031) * firefox: thunderbird: JavaScript engine only wrote partial return value to stack (CVE-2025-8027) * firefox: thunderbird: Potential user-assisted code execution in ?Copy as cURL? command (CVE-2025-8030) * firefox: Memory safety bugs (CVE-2025-8034) * firefox: thunderbird: Incorrect JavaScript state machine for generators (CVE-2025-8033) * firefox: thunderbird: XSLT documents could bypass CSP (CVE-2025-8032) * firefox: thunderbird: javascript: URLs executed on object and embed tags (CVE-2025-8029) 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.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Red Hat Product Security issued an important security advisory (RHSA-2025:11748) for Mozilla Firefox and Thunderbird packages on Red Hat Enterprise Linux 9 and its extended update support versions. The advisory addresses nine vulnerabilities (CVE-2025-8027, CVE-2025-8028, CVE-2025-8029, CVE-2025-8030, CVE-2025-8031, CVE-2025-8032, CVE-2025-8033, CVE-2025-8034, CVE-2025-8035) including memory safety bugs, incorrect URL stripping in CSP reports, partial return value writes in the JavaScript engine, potential user-assisted code execution via the 'Copy as cURL' command, CSP bypass via XSLT documents, and execution of javascript: URLs in object/embed tags. These vulnerabilities collectively impact the security posture of Firefox and Thunderbird on affected Red Hat Enterprise Linux 9 platforms. The advisory references fixes available in updated Firefox packages (version 128.13.0-1.el9_6) for multiple architectures and support variants.
Potential Impact
The vulnerabilities include memory safety bugs that could lead to crashes or potentially exploitable conditions, incorrect handling of URLs in CSP reports that might weaken security policies, partial writes in the JavaScript engine that could cause unpredictable behavior, and a user-assisted code execution vector via the 'Copy as cURL' feature. Additionally, CSP bypass via XSLT documents and execution of javascript: URLs in object/embed tags could allow malicious content to execute in contexts where it should be restricted. These issues collectively pose a high security risk by potentially enabling code execution, policy bypass, or memory corruption.
Mitigation Recommendations
Red Hat has released updated Firefox packages addressing these vulnerabilities. Users and administrators should apply the security update as detailed in the Red Hat advisory RHSA-2025:11748 and the referenced article https://access.redhat.com/articles/11258. The update is available for Red Hat Enterprise Linux 9 and its extended update support versions across multiple architectures. Applying these official patches is the recommended remediation. Patch status is confirmed by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2025:11748
- Cve Count
- 9
- Additional Cves
- ["CVE-2025-8028","CVE-2025-8029","CVE-2025-8030","CVE-2025-8031","CVE-2025-8032","CVE-2025-8033","CVE-2025-8034","CVE-2025-8035"]
Threat ID: 6a3cc29f4853345fc16d44ab
Added to database: 06/25/2026, 05:54:39 UTC
Last enriched: 06/25/2026, 06:01:01 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 71
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