RHSA-2025:8756 - 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):

• thunderbird: JavaScript Execution via Spoofed PDF Attachment and file:/// Link (CVE-2025-3909)
• thunderbird: Sender Spoofing via Malformed From Header in Thunderbird (CVE-2025-3875)
• thunderbird: Unsolicited File Download, Disk Space Exhaustion, and Credential Leakage via mailbox:/// Links (CVE-2025-3877)
• thunderbird: Tracking Links in Attachments Bypassed Remote Content Blocking (CVE-2025-3932)
• 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 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 - 2366283 - CVE-2025-3909 thunderbird: JavaScript Execution via Spoofed PDF Attachment and file:/// Link
• BZ - 2366287 - CVE-2025-3875 thunderbird: Sender Spoofing via Malformed From Header in Thunderbird
• BZ - 2366291 - CVE-2025-3877 thunderbird: Unsolicited File Download, Disk Space Exhaustion, and Credential Leakage via mailbox:/// Links
• BZ - 2366297 - CVE-2025-3932 thunderbird: Tracking Links in Attachments Bypassed Remote Content Blocking
• 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-2025-3875
• CVE-2025-3877
• CVE-2025-3909
• CVE-2025-3932
• 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