RHSA-2025:8629 - Security Advisory

Topic

An update for thunderbird 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 Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

• firefox: thunderbird: Out-of-bounds access when resolving Promise objects (CVE-2025-4918)
• firefox: thunderbird: Out-of-bounds access when optimizing linear sums (CVE-2025-4919)
• firefox: thunderbird: Clickjacking vulnerability could have led to leaking saved payment card details (CVE-2025-5267)
• firefox: thunderbird: Potential local code execution in ?Copy as cURL? command (CVE-2025-5264)
• firefox: thunderbird: Memory safety bugs (CVE-2025-5268)
• firefox: thunderbird: Script element events leaked cross-origin resource status (CVE-2025-5266)
• firefox: thunderbird: Error handling for script execution was incorrectly isolated from web content (CVE-2025-5263)
• firefox: thunderbird: Memory safety bug (CVE-2025-5269)

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 - 2367016 - CVE-2025-4918 firefox: thunderbird: Out-of-bounds access when resolving Promise objects
• BZ - 2367018 - CVE-2025-4919 firefox: thunderbird: Out-of-bounds access when optimizing linear sums
• BZ - 2368750 - CVE-2025-5267 firefox: thunderbird: Clickjacking vulnerability could have led to leaking saved payment card details
• BZ - 2368751 - CVE-2025-5264 firefox: thunderbird: Potential local code execution in ?Copy as cURL? command
• BZ - 2368752 - CVE-2025-5268 firefox: thunderbird: Memory safety bugs
• BZ - 2368755 - CVE-2025-5266 firefox: thunderbird: Script element events leaked cross-origin resource status
• BZ - 2368756 - CVE-2025-5263 firefox: thunderbird: Error handling for script execution was incorrectly isolated from web content
• BZ - 2368757 - CVE-2025-5269 firefox: thunderbird: Memory safety bug

CVEs

• CVE-2025-4918
• CVE-2025-4919
• CVE-2025-5263
• CVE-2025-5264
• CVE-2025-5266
• CVE-2025-5267
• CVE-2025-5268
• CVE-2025-5269
• CVE-2025-5283

References

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