Red Hat Security Advisory: thunderbird security update
Multiple security vulnerabilities affecting Mozilla Thunderbird have been addressed in Red Hat Enterprise Linux 9.2 updates. These include memory safety bugs, use-after-free, JIT miscompilation, sandbox escape, privilege escalation, and same-origin policy bypass issues. The vulnerabilities impact various components such as WebRTC signaling, JavaScript engine JIT, graphics CanvasWebGL, Netmonitor, request handling, and DOM notifications. Red Hat has released security updates to fix these issues in Thunderbird ESR 140.6 and Thunderbird 146 versions. The advisory rates the security impact as Important (high severity).
AI Analysis
Technical Summary
This advisory covers multiple security fixes for Mozilla Thunderbird as packaged by Red Hat for RHEL 9.2. The vulnerabilities include memory safety bugs (CVE-2025-14333), use-after-free in WebRTC signaling (CVE-2025-14321), several JIT miscompilation issues in the JavaScript engine (CVE-2025-14324, CVE-2025-14325, CVE-2025-14330), sandbox escape via CanvasWebGL graphics component (CVE-2025-14322), privilege escalation in Netmonitor and DOM notifications components (CVE-2025-14323, CVE-2025-14328, CVE-2025-14329), and same-origin policy bypass in request handling (CVE-2025-14331). These vulnerabilities affect Thunderbird ESR 140.6 and Thunderbird 146 versions. Red Hat has issued updated packages to remediate these issues as part of RHSA-2026:0019.
Potential Impact
The vulnerabilities collectively could allow attackers to execute arbitrary code, escalate privileges, bypass security policies, or escape sandbox restrictions within the Thunderbird mail client. This could lead to unauthorized access or control over the affected system. The advisory rates the impact as Important, indicating a high severity level but no confirmed exploits in the wild at the time of publication.
Mitigation Recommendations
Red Hat has released updated Thunderbird packages for Red Hat Enterprise Linux 9.2 that address these vulnerabilities. Users should apply the security update RHSA-2026:0019 promptly to remediate these issues. For detailed update instructions, refer to Red Hat's official article at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated beyond applying the official update.
Red Hat Security Advisory: thunderbird security update
Description
Multiple security vulnerabilities affecting Mozilla Thunderbird have been addressed in Red Hat Enterprise Linux 9.2 updates. These include memory safety bugs, use-after-free, JIT miscompilation, sandbox escape, privilege escalation, and same-origin policy bypass issues. The vulnerabilities impact various components such as WebRTC signaling, JavaScript engine JIT, graphics CanvasWebGL, Netmonitor, request handling, and DOM notifications. Red Hat has released security updates to fix these issues in Thunderbird ESR 140.6 and Thunderbird 146 versions. The advisory rates the security impact as Important (high severity).
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This advisory covers multiple security fixes for Mozilla Thunderbird as packaged by Red Hat for RHEL 9.2. The vulnerabilities include memory safety bugs (CVE-2025-14333), use-after-free in WebRTC signaling (CVE-2025-14321), several JIT miscompilation issues in the JavaScript engine (CVE-2025-14324, CVE-2025-14325, CVE-2025-14330), sandbox escape via CanvasWebGL graphics component (CVE-2025-14322), privilege escalation in Netmonitor and DOM notifications components (CVE-2025-14323, CVE-2025-14328, CVE-2025-14329), and same-origin policy bypass in request handling (CVE-2025-14331). These vulnerabilities affect Thunderbird ESR 140.6 and Thunderbird 146 versions. Red Hat has issued updated packages to remediate these issues as part of RHSA-2026:0019.
Potential Impact
The vulnerabilities collectively could allow attackers to execute arbitrary code, escalate privileges, bypass security policies, or escape sandbox restrictions within the Thunderbird mail client. This could lead to unauthorized access or control over the affected system. The advisory rates the impact as Important, indicating a high severity level but no confirmed exploits in the wild at the time of publication.
Mitigation Recommendations
Red Hat has released updated Thunderbird packages for Red Hat Enterprise Linux 9.2 that address these vulnerabilities. Users should apply the security update RHSA-2026:0019 promptly to remediate these issues. For detailed update instructions, refer to Red Hat's official article at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated beyond applying the official update.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:0019
- 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: 6a4049de27e9c7971983146a
Added to database: 06/27/2026, 22:08:30 UTC
Last enriched: 06/27/2026, 22:25:52 UTC
Last updated: 09/10/2026, 19:36:49 UTC
Views: 18
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