Red Hat Security Advisory: thunderbird security update
Multiple security vulnerabilities affecting Mozilla Thunderbird and related components have been addressed in Red Hat Enterprise Linux 8.8. These include arbitrary code execution due to a use-after-free in libpng, information disclosure and denial of service via out-of-bounds read/write in libpng's Neon palette expansion, memory safety bugs in Thunderbird and Firefox ESR versions, and an integer overflow in the Graphics: Text component. Red Hat has released updated Thunderbird packages to fix these issues.
AI Analysis
Technical Summary
This advisory covers several vulnerabilities impacting Mozilla Thunderbird and its dependencies as packaged in Red Hat Enterprise Linux 8.8. The issues include CVE-2026-33416, a use-after-free in libpng leading to arbitrary code execution; CVE-2026-33636, an out-of-bounds read/write in libpng causing information disclosure and denial of service; CVE-2026-5731 and CVE-2026-5734, memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2, and Thunderbird 149.0.2; and CVE-2026-5732, an integer overflow in the Graphics: Text component affecting Firefox and Thunderbird. Red Hat has issued updated Thunderbird packages (version 140.9.1-1.el8_8) to address these vulnerabilities.
Potential Impact
Successful exploitation of these vulnerabilities could lead to arbitrary code execution, information disclosure, denial of service, and memory safety issues within the Thunderbird mail client and its underlying libraries. These impacts can compromise the confidentiality, integrity, and availability of affected systems running vulnerable versions of Thunderbird on Red Hat Enterprise Linux 8.8.
Mitigation Recommendations
Red Hat has released updated Thunderbird packages (version 140.9.1-1.el8_8) for Red Hat Enterprise Linux 8.8 that address these vulnerabilities. Users should apply these official updates promptly following Red Hat's guidance at https://access.redhat.com/articles/11258. No additional mitigations are specified by the vendor.
Red Hat Security Advisory: thunderbird security update
Description
Multiple security vulnerabilities affecting Mozilla Thunderbird and related components have been addressed in Red Hat Enterprise Linux 8.8. These include arbitrary code execution due to a use-after-free in libpng, information disclosure and denial of service via out-of-bounds read/write in libpng's Neon palette expansion, memory safety bugs in Thunderbird and Firefox ESR versions, and an integer overflow in the Graphics: Text component. Red Hat has released updated Thunderbird packages to fix these issues.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This advisory covers several vulnerabilities impacting Mozilla Thunderbird and its dependencies as packaged in Red Hat Enterprise Linux 8.8. The issues include CVE-2026-33416, a use-after-free in libpng leading to arbitrary code execution; CVE-2026-33636, an out-of-bounds read/write in libpng causing information disclosure and denial of service; CVE-2026-5731 and CVE-2026-5734, memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2, and Thunderbird 149.0.2; and CVE-2026-5732, an integer overflow in the Graphics: Text component affecting Firefox and Thunderbird. Red Hat has issued updated Thunderbird packages (version 140.9.1-1.el8_8) to address these vulnerabilities.
Potential Impact
Successful exploitation of these vulnerabilities could lead to arbitrary code execution, information disclosure, denial of service, and memory safety issues within the Thunderbird mail client and its underlying libraries. These impacts can compromise the confidentiality, integrity, and availability of affected systems running vulnerable versions of Thunderbird on Red Hat Enterprise Linux 8.8.
Mitigation Recommendations
Red Hat has released updated Thunderbird packages (version 140.9.1-1.el8_8) for Red Hat Enterprise Linux 8.8 that address these vulnerabilities. Users should apply these official updates promptly following Red Hat's guidance at https://access.redhat.com/articles/11258. No additional mitigations are specified by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:14223
- Cve Count
- 5
- Additional Cves
- ["CVE-2026-5732","CVE-2026-5734","CVE-2026-33416","CVE-2026-33636"]
- Cvss Version
- null
Threat ID: 6a16097ee29bf47b5064aff4
Added to database: 05/26/2026, 20:58:38 UTC
Last enriched: 07/23/2026, 00:51:09 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 58
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