RHSA-2025:15496 - Security Advisory

Topic

An update for thunderbird is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

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 Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

• firefox: thunderbird: Denial-of-service due to out-of-memory in the Graphics: WebRender component (CVE-2025-9182)
• thunderbird: firefox: Sandbox escape due to invalid pointer in the Audio/Video: GMP component (CVE-2025-9179)
• thunderbird: firefox: Same-origin policy bypass in the Graphics: Canvas2D component (CVE-2025-9180)
• thunderbird: firefox: Uninitialized memory in the JavaScript Engine component (CVE-2025-9181)
• thunderbird: firefox: Memory safety bugs fixed in Firefox ESR 115.27, Firefox ESR 128.14, Thunderbird ESR 128.14, Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142 (CVE-2025-9185)

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 8.4 x86_64
• Red Hat Enterprise Linux Server - AUS 8.4 x86_64

Fixes

• BZ - 2389575 - CVE-2025-9182 firefox: thunderbird: Denial-of-service due to out-of-memory in the Graphics: WebRender component
• BZ - 2389580 - CVE-2025-9179 thunderbird: firefox: Sandbox escape due to invalid pointer in the Audio/Video: GMP component
• BZ - 2389581 - CVE-2025-9180 thunderbird: firefox: Same-origin policy bypass in the Graphics: Canvas2D component
• BZ - 2389583 - CVE-2025-9181 thunderbird: firefox: Uninitialized memory in the JavaScript Engine component
• BZ - 2389584 - CVE-2025-9185 thunderbird: firefox: Memory safety bugs fixed in Firefox ESR 115.27, Firefox ESR 128.14, Thunderbird ESR 128.14, Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142

CVEs

• CVE-2025-9179
• CVE-2025-9180
• CVE-2025-9181
• CVE-2025-9182
• CVE-2025-9185

References

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