RHSA-2025:12361 - Security Advisory

Topic

An update for firefox is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions, and Red Hat Enterprise Linux 8.6 Telecommunications Update Service.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support Extension 8.6 x86_64
• Red Hat Enterprise Linux Server - AUS 8.6 x86_64
• Red Hat Enterprise Linux Server - TUS 8.6 x86_64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.6 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.6 x86_64

Fixes

• BZ - 2382701 - CVE-2025-8028 firefox: thunderbird: Large branch table could lead to truncated instruction
• BZ - 2382703 - CVE-2025-8035 firefox: thunderbird: Memory safety bugs
• BZ - 2382704 - CVE-2025-8031 firefox: thunderbird: Incorrect URL stripping in CSP reports
• BZ - 2382707 - CVE-2025-8027 firefox: thunderbird: JavaScript engine only wrote partial return value to stack
• BZ - 2382710 - CVE-2025-8030 firefox: thunderbird: Potential user-assisted code execution in ?Copy as cURL? command
• BZ - 2382711 - CVE-2025-8034 firefox: Memory safety bugs
• BZ - 2382717 - CVE-2025-8033 firefox: thunderbird: Incorrect JavaScript state machine for generators
• BZ - 2382718 - CVE-2025-8032 firefox: thunderbird: XSLT documents could bypass CSP
• BZ - 2382720 - CVE-2025-8029 firefox: thunderbird: javascript: URLs executed on object and embed tags

CVEs

• 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

References

• https://access.redhat.com/security/updates/classification/#important