Red Hat Security Advisory: thunderbird security update
Multiple security vulnerabilities affecting Mozilla Thunderbird have been addressed in a Red Hat security update. These include memory safety bugs, use-after-free, JIT miscompilation, sandbox escape, privilege escalation, and same-origin policy bypass issues. The update is rated as important by Red Hat and applies to Thunderbird ESR 140.6 and Thunderbird 146 versions. The advisory covers Red Hat Enterprise Linux 8.8 variants. No known exploits in the wild have been reported at this time.
AI Analysis
Technical Summary
This Red Hat security advisory addresses a set of vulnerabilities in Mozilla Thunderbird, including a use-after-free in the WebRTC signaling component (CVE-2025-14321), multiple JIT miscompilation issues in the JavaScript engine (CVE-2025-14324, CVE-2025-14325, CVE-2025-14330), memory safety bugs (CVE-2025-14333), sandbox escape due to incorrect boundary conditions in the CanvasWebGL graphics component (CVE-2025-14322), privilege escalations in the Netmonitor and DOM Notifications components (CVE-2025-14323, CVE-2025-14328, CVE-2025-14329), and a same-origin policy bypass in the Request Handling component (CVE-2025-14331). These vulnerabilities affect Thunderbird ESR 140.6 and Thunderbird 146 as packaged for Red Hat Enterprise Linux 8.8. The advisory provides updated Thunderbird packages to remediate these issues.
Potential Impact
The vulnerabilities collectively could allow attackers to execute arbitrary code, escalate privileges, bypass security policies such as same-origin, or escape sandbox restrictions within the Thunderbird client. This could compromise the confidentiality, integrity, and security of the affected systems running vulnerable versions of Thunderbird. However, no known exploits in the wild have been reported at the time of this advisory.
Mitigation Recommendations
Red Hat has released updated Thunderbird packages (version 140.6.0-1.el8_8) for Red Hat Enterprise Linux 8.8 variants that address these vulnerabilities. Users should apply these official updates promptly to remediate the issues. For detailed update instructions, refer to the Red Hat advisory at https://access.redhat.com/articles/11258. Since official fixes are available, applying the update is the recommended mitigation.
Red Hat Security Advisory: thunderbird security update
Description
Multiple security vulnerabilities affecting Mozilla Thunderbird have been addressed in a Red Hat security update. These include memory safety bugs, use-after-free, JIT miscompilation, sandbox escape, privilege escalation, and same-origin policy bypass issues. The update is rated as important by Red Hat and applies to Thunderbird ESR 140.6 and Thunderbird 146 versions. The advisory covers Red Hat Enterprise Linux 8.8 variants. No known exploits in the wild have been reported at this time.
Affected software
pkg:rpm/redhat/thunderbirdRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This Red Hat security advisory addresses a set of vulnerabilities in Mozilla Thunderbird, including a use-after-free in the WebRTC signaling component (CVE-2025-14321), multiple JIT miscompilation issues in the JavaScript engine (CVE-2025-14324, CVE-2025-14325, CVE-2025-14330), memory safety bugs (CVE-2025-14333), sandbox escape due to incorrect boundary conditions in the CanvasWebGL graphics component (CVE-2025-14322), privilege escalations in the Netmonitor and DOM Notifications components (CVE-2025-14323, CVE-2025-14328, CVE-2025-14329), and a same-origin policy bypass in the Request Handling component (CVE-2025-14331). These vulnerabilities affect Thunderbird ESR 140.6 and Thunderbird 146 as packaged for Red Hat Enterprise Linux 8.8. The advisory provides updated Thunderbird packages to remediate these issues.
Potential Impact
The vulnerabilities collectively could allow attackers to execute arbitrary code, escalate privileges, bypass security policies such as same-origin, or escape sandbox restrictions within the Thunderbird client. This could compromise the confidentiality, integrity, and security of the affected systems running vulnerable versions of Thunderbird. However, no known exploits in the wild have been reported at the time of this advisory.
Mitigation Recommendations
Red Hat has released updated Thunderbird packages (version 140.6.0-1.el8_8) for Red Hat Enterprise Linux 8.8 variants that address these vulnerabilities. Users should apply these official updates promptly to remediate the issues. For detailed update instructions, refer to the Red Hat advisory at https://access.redhat.com/articles/11258. Since official fixes are available, applying the update is the recommended mitigation.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:0021
- Cve Count
- 10
- Additional Cves
- ["CVE-2025-14322","CVE-2025-14323","CVE-2025-14324","CVE-2025-14325","CVE-2025-14328","CVE-2025-14329","CVE-2025-14330","CVE-2025-14331","CVE-2025-14333"]
Threat ID: 6a4049de27e9c7971983144c
Added to database: 06/27/2026, 22:08:30 UTC
Last enriched: 06/27/2026, 22:25:38 UTC
Last updated: 09/10/2026, 19:36:49 UTC
Views: 16
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