Red Hat Security Advisory: thunderbird security update
Multiple security vulnerabilities affecting Mozilla Thunderbird have been addressed in a Red Hat security advisory. These include memory safety bugs, use-after-free, JIT miscompilation, sandbox escape, privilege escalation, and same-origin policy bypass issues. The fixes correspond to updates in Thunderbird ESR 140.6 and Thunderbird 146. The advisory covers several CVEs related to Firefox components shared with Thunderbird. Red Hat has released updated packages for Red Hat Enterprise Linux 8.4 variants to remediate these issues.
AI Analysis
Technical Summary
This Red Hat security advisory addresses a set of vulnerabilities in Mozilla Thunderbird, including memory safety bugs (CVE-2025-14333), 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), sandbox escape due to incorrect boundary conditions in the Graphics CanvasWebGL component (CVE-2025-14322), privilege escalation in the Netmonitor component (CVE-2025-14328, CVE-2025-14329) and DOM Notifications component (CVE-2025-14323), and a same-origin policy bypass in the Request Handling component (CVE-2025-14331). These vulnerabilities were fixed in Thunderbird ESR 140.6 and Thunderbird 146. Red Hat has issued updated packages for Red Hat Enterprise Linux 8.4 Extended Update Support and Advanced Update Support to address these issues. The advisory references multiple bugzilla entries and CVE pages for detailed impact and scoring information.
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 mail client. These issues affect core components including WebRTC signaling, JavaScript engine JIT compilation, graphics rendering, network monitoring, and DOM notifications. Successful exploitation could compromise the confidentiality, integrity, or availability of the affected system or user data. The advisory rates the overall security impact as Important (high severity). No known exploits in the wild are reported at this time.
Mitigation Recommendations
Red Hat has released updated Thunderbird packages (version 140.6.0-1.el8_4) for Red Hat Enterprise Linux 8.4 Extended Update Support and Advanced Update Support. Users should apply these official updates promptly to remediate the vulnerabilities. For detailed update instructions, refer to Red Hat's article at https://access.redhat.com/articles/11258. No additional mitigations or workarounds are specified in the advisory. Patch status is confirmed as fixed in the updated packages.
Red Hat Security Advisory: thunderbird security update
Description
Multiple security vulnerabilities affecting Mozilla Thunderbird have been addressed in a Red Hat security advisory. These include memory safety bugs, use-after-free, JIT miscompilation, sandbox escape, privilege escalation, and same-origin policy bypass issues. The fixes correspond to updates in Thunderbird ESR 140.6 and Thunderbird 146. The advisory covers several CVEs related to Firefox components shared with Thunderbird. Red Hat has released updated packages for Red Hat Enterprise Linux 8.4 variants to remediate these issues.
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This Red Hat security advisory addresses a set of vulnerabilities in Mozilla Thunderbird, including memory safety bugs (CVE-2025-14333), 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), sandbox escape due to incorrect boundary conditions in the Graphics CanvasWebGL component (CVE-2025-14322), privilege escalation in the Netmonitor component (CVE-2025-14328, CVE-2025-14329) and DOM Notifications component (CVE-2025-14323), and a same-origin policy bypass in the Request Handling component (CVE-2025-14331). These vulnerabilities were fixed in Thunderbird ESR 140.6 and Thunderbird 146. Red Hat has issued updated packages for Red Hat Enterprise Linux 8.4 Extended Update Support and Advanced Update Support to address these issues. The advisory references multiple bugzilla entries and CVE pages for detailed impact and scoring information.
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 mail client. These issues affect core components including WebRTC signaling, JavaScript engine JIT compilation, graphics rendering, network monitoring, and DOM notifications. Successful exploitation could compromise the confidentiality, integrity, or availability of the affected system or user data. The advisory rates the overall security impact as Important (high severity). No known exploits in the wild are reported at this time.
Mitigation Recommendations
Red Hat has released updated Thunderbird packages (version 140.6.0-1.el8_4) for Red Hat Enterprise Linux 8.4 Extended Update Support and Advanced Update Support. Users should apply these official updates promptly to remediate the vulnerabilities. For detailed update instructions, refer to Red Hat's article at https://access.redhat.com/articles/11258. No additional mitigations or workarounds are specified in the advisory. Patch status is confirmed as fixed in the updated packages.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:0023
- 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: 6a4049de27e9c7971983143d
Added to database: 06/27/2026, 22:08:30 UTC
Last enriched: 06/27/2026, 22:25:32 UTC
Last updated: 09/10/2026, 19:36:49 UTC
Views: 13
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