RHSA-2025:16589 - Security Advisory

Topic

An update for thunderbird is now available for Red Hat Enterprise Linux 8.

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: 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.

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 8 x86_64
• Red Hat Enterprise Linux for IBM z Systems 8 s390x
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for ARM 64 8 aarch64

Fixes

• BZ - 2395745 - CVE-2025-10527 firefox: thunderbird: Sandbox escape due to use-after-free in the Graphics: Canvas2D component
• BZ - 2395754 - CVE-2025-10532 firefox: thunderbird: Incorrect boundary conditions in the JavaScript: GC component
• BZ - 2395755 - CVE-2025-10528 firefox: thunderbird: Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component
• BZ - 2395756 - CVE-2025-10529 firefox: thunderbird: Same-origin policy bypass in the Layout component
• BZ - 2395759 - CVE-2025-10537 firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.3, Thunderbird ESR 140.3, Firefox 143 and Thunderbird 143
• BZ - 2395764 - CVE-2025-10536 firefox: thunderbird: Information disclosure in the Networking: Cache component
• BZ - 2395766 - CVE-2025-10533 firefox: thunderbird: Integer overflow in the SVG component

CVEs

• CVE-2025-10527
• CVE-2025-10528
• CVE-2025-10529
• CVE-2025-10532
• CVE-2025-10533
• CVE-2025-10536
• CVE-2025-10537

References

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