Red Hat Security Advisory: thunderbird security update
Multiple security vulnerabilities affecting Mozilla Thunderbird have been addressed in a Red Hat security advisory. These include sandbox escapes due to use-after-free and undefined behavior in the Graphics Canvas2D component, a same-origin policy bypass in the Layout component, memory safety bugs, information disclosure in the Networking Cache component, an integer overflow in the SVG component, and incorrect boundary conditions in the JavaScript garbage collector. The update is rated as important by Red Hat and applies to Thunderbird version 140.3.0-1.el9_0 on Red Hat Enterprise Linux 9.0. Users are advised to apply the security update provided by Red Hat to mitigate these issues.
AI Analysis
Technical Summary
The Red Hat security advisory RHSA-2025:17344 addresses seven distinct vulnerabilities in Mozilla Thunderbird, including CVE-2025-10527 (sandbox escape via use-after-free in Graphics: Canvas2D), CVE-2025-10528 (sandbox escape due to undefined behavior and invalid pointer in Graphics: Canvas2D), CVE-2025-10529 (same-origin policy bypass in Layout), CVE-2025-10532 (incorrect boundary conditions in JavaScript garbage collector), CVE-2025-10533 (integer overflow in SVG component), CVE-2025-10536 (information disclosure in Networking Cache), and CVE-2025-10537 (memory safety bugs fixed in Thunderbird ESR 140.3 and Firefox ESR 140.3). These vulnerabilities could allow sandbox escapes, policy bypasses, memory corruption, and information leaks. The advisory covers Thunderbird version 140.3.0-1.el9_0 on Red Hat Enterprise Linux 9.0 across multiple architectures. The update is classified as important by Red Hat Product Security. No CVSS scores are provided in the advisory, and no known exploits in the wild have been reported.
Potential Impact
The vulnerabilities fixed in this update include sandbox escapes that could allow malicious code to break out of restricted execution environments, a same-origin policy bypass that could enable unauthorized access to web content, memory safety bugs that could lead to crashes or code execution, information disclosure vulnerabilities that could leak sensitive data, and an integer overflow that could cause unexpected behavior. Collectively, these issues pose a high security risk if exploited, potentially compromising the confidentiality, integrity, and security boundaries of the Thunderbird application environment.
Mitigation Recommendations
Red Hat has released an updated Thunderbird package (version 140.3.0-1.el9_0) for Red Hat Enterprise Linux 9.0 that addresses these vulnerabilities. Users should apply this official security update promptly to remediate the issues. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigations are specified or required beyond applying the vendor-provided patch.
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 sandbox escapes due to use-after-free and undefined behavior in the Graphics Canvas2D component, a same-origin policy bypass in the Layout component, memory safety bugs, information disclosure in the Networking Cache component, an integer overflow in the SVG component, and incorrect boundary conditions in the JavaScript garbage collector. The update is rated as important by Red Hat and applies to Thunderbird version 140.3.0-1.el9_0 on Red Hat Enterprise Linux 9.0. Users are advised to apply the security update provided by Red Hat to mitigate these issues.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Red Hat security advisory RHSA-2025:17344 addresses seven distinct vulnerabilities in Mozilla Thunderbird, including CVE-2025-10527 (sandbox escape via use-after-free in Graphics: Canvas2D), CVE-2025-10528 (sandbox escape due to undefined behavior and invalid pointer in Graphics: Canvas2D), CVE-2025-10529 (same-origin policy bypass in Layout), CVE-2025-10532 (incorrect boundary conditions in JavaScript garbage collector), CVE-2025-10533 (integer overflow in SVG component), CVE-2025-10536 (information disclosure in Networking Cache), and CVE-2025-10537 (memory safety bugs fixed in Thunderbird ESR 140.3 and Firefox ESR 140.3). These vulnerabilities could allow sandbox escapes, policy bypasses, memory corruption, and information leaks. The advisory covers Thunderbird version 140.3.0-1.el9_0 on Red Hat Enterprise Linux 9.0 across multiple architectures. The update is classified as important by Red Hat Product Security. No CVSS scores are provided in the advisory, and no known exploits in the wild have been reported.
Potential Impact
The vulnerabilities fixed in this update include sandbox escapes that could allow malicious code to break out of restricted execution environments, a same-origin policy bypass that could enable unauthorized access to web content, memory safety bugs that could lead to crashes or code execution, information disclosure vulnerabilities that could leak sensitive data, and an integer overflow that could cause unexpected behavior. Collectively, these issues pose a high security risk if exploited, potentially compromising the confidentiality, integrity, and security boundaries of the Thunderbird application environment.
Mitigation Recommendations
Red Hat has released an updated Thunderbird package (version 140.3.0-1.el9_0) for Red Hat Enterprise Linux 9.0 that addresses these vulnerabilities. Users should apply this official security update promptly to remediate the issues. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigations are specified or required beyond applying the vendor-provided patch.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2025:17344
- Cve Count
- 7
- Additional Cves
- ["CVE-2025-10528","CVE-2025-10529","CVE-2025-10532","CVE-2025-10533","CVE-2025-10536","CVE-2025-10537"]
Threat ID: 6a419cb327e9c79719abc583
Added to database: 06/28/2026, 22:14:11 UTC
Last enriched: 08/22/2026, 22:21:10 UTC
Last updated: 09/10/2026, 19:36:49 UTC
Views: 29
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