Red Hat Security Advisory: thunderbird security update
Multiple security vulnerabilities have been identified in Mozilla Thunderbird as packaged for Red Hat Enterprise Linux 10. These include JavaScript execution via spoofed PDF attachments and file:/// links, sender spoofing through malformed From headers, unsolicited file downloads causing disk space exhaustion and credential leakage via mailbox:/// links, and tracking links in attachments bypassing remote content blocking. Red Hat has issued an important security advisory with updates addressing these issues.
AI Analysis
Technical Summary
This advisory covers four distinct vulnerabilities in Mozilla Thunderbird affecting Red Hat Enterprise Linux 10. CVE-2025-3909 allows JavaScript execution through spoofed PDF attachments and file:/// links. CVE-2025-3875 enables sender spoofing via malformed From headers. CVE-2025-3877 involves unsolicited file downloads, disk space exhaustion, and credential leakage through mailbox:/// links. CVE-2025-3932 allows tracking links in attachments to bypass remote content blocking. Red Hat has released updated Thunderbird packages to remediate these vulnerabilities.
Potential Impact
The vulnerabilities could allow attackers to execute JavaScript code, spoof sender identities, cause unsolicited file downloads leading to disk space exhaustion, leak credentials, and bypass remote content blocking mechanisms. These issues may compromise user privacy and security when handling email attachments and links in Thunderbird on affected Red Hat Enterprise Linux 10 systems.
Mitigation Recommendations
Red Hat has released updated Thunderbird packages (version 128.10.1-1.el10_0) that address these vulnerabilities. Users of Red Hat Enterprise Linux 10 should apply these security updates promptly. Detailed update instructions are available at https://access.redhat.com/articles/11258. No indication of alternative mitigations or that no action is required was provided.
Red Hat Security Advisory: thunderbird security update
Description
Multiple security vulnerabilities have been identified in Mozilla Thunderbird as packaged for Red Hat Enterprise Linux 10. These include JavaScript execution via spoofed PDF attachments and file:/// links, sender spoofing through malformed From headers, unsolicited file downloads causing disk space exhaustion and credential leakage via mailbox:/// links, and tracking links in attachments bypassing remote content blocking. Red Hat has issued an important security advisory with updates addressing these issues.
Affected software
pkg:rpm/redhat/thunderbirdRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This advisory covers four distinct vulnerabilities in Mozilla Thunderbird affecting Red Hat Enterprise Linux 10. CVE-2025-3909 allows JavaScript execution through spoofed PDF attachments and file:/// links. CVE-2025-3875 enables sender spoofing via malformed From headers. CVE-2025-3877 involves unsolicited file downloads, disk space exhaustion, and credential leakage through mailbox:/// links. CVE-2025-3932 allows tracking links in attachments to bypass remote content blocking. Red Hat has released updated Thunderbird packages to remediate these vulnerabilities.
Potential Impact
The vulnerabilities could allow attackers to execute JavaScript code, spoof sender identities, cause unsolicited file downloads leading to disk space exhaustion, leak credentials, and bypass remote content blocking mechanisms. These issues may compromise user privacy and security when handling email attachments and links in Thunderbird on affected Red Hat Enterprise Linux 10 systems.
Mitigation Recommendations
Red Hat has released updated Thunderbird packages (version 128.10.1-1.el10_0) that address these vulnerabilities. Users of Red Hat Enterprise Linux 10 should apply these security updates promptly. Detailed update instructions are available at https://access.redhat.com/articles/11258. No indication of alternative mitigations or that no action is required was provided.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2025:8196
- Cve Count
- 4
- Additional Cves
- ["CVE-2025-3877","CVE-2025-3909","CVE-2025-3932"]
Threat ID: 6a4049e627e9c7971983462a
Added to database: 06/27/2026, 22:08:38 UTC
Last enriched: 08/07/2026, 00:51:20 UTC
Last updated: 09/10/2026, 19:36:50 UTC
Views: 20
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