Red Hat Security Advisory: thunderbird security update
Multiple security vulnerabilities affecting Mozilla Firefox and related components have been addressed in Red Hat Enterprise Linux 8.4 updates. 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, and an integer overflow in the graphics text component. The vulnerabilities are fixed in Firefox ESR 140.9.1 and Firefox 149.0.2 packages provided by Red Hat. The update is rated as Important by Red Hat Product Security.
AI Analysis
Technical Summary
The advisory covers several security fixes for Mozilla Firefox and Thunderbird, including: a use-after-free vulnerability in libpng leading to arbitrary code execution (CVE-2026-33416); out-of-bounds read/write in libpng causing information disclosure and denial of service (CVE-2026-33636); multiple memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2, and Thunderbird 149.0.2 (CVE-2026-5731, CVE-2026-5734); and an integer overflow in the graphics text component (CVE-2026-5732). These issues are addressed by updated Firefox packages provided by Red Hat for Red Hat Enterprise Linux 10 and its extended update support versions.
Potential Impact
The vulnerabilities include arbitrary code execution, information disclosure, denial of service, and memory safety issues that could allow attackers to compromise affected systems running vulnerable versions of Firefox and Thunderbird on Red Hat Enterprise Linux 10. The security impact is rated as Important by Red Hat Product Security.
Mitigation Recommendations
Red Hat has released updated Firefox packages (version 140.9.1-1.el10_1 and related) that fix the described vulnerabilities. Users of Red Hat Enterprise Linux 10 and its variants should apply these official updates promptly. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigations are indicated beyond applying the vendor-provided patches.
Red Hat Security Advisory: thunderbird security update
Description
Multiple security vulnerabilities affecting Mozilla Firefox and related components have been addressed in Red Hat Enterprise Linux 8.4 updates. 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, and an integer overflow in the graphics text component. The vulnerabilities are fixed in Firefox ESR 140.9.1 and Firefox 149.0.2 packages provided by Red Hat. The update is rated as Important by Red Hat Product Security.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The advisory covers several security fixes for Mozilla Firefox and Thunderbird, including: a use-after-free vulnerability in libpng leading to arbitrary code execution (CVE-2026-33416); out-of-bounds read/write in libpng causing information disclosure and denial of service (CVE-2026-33636); multiple memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2, and Thunderbird 149.0.2 (CVE-2026-5731, CVE-2026-5734); and an integer overflow in the graphics text component (CVE-2026-5732). These issues are addressed by updated Firefox packages provided by Red Hat for Red Hat Enterprise Linux 10 and its extended update support versions.
Potential Impact
The vulnerabilities include arbitrary code execution, information disclosure, denial of service, and memory safety issues that could allow attackers to compromise affected systems running vulnerable versions of Firefox and Thunderbird on Red Hat Enterprise Linux 10. The security impact is rated as Important by Red Hat Product Security.
Mitigation Recommendations
Red Hat has released updated Firefox packages (version 140.9.1-1.el10_1 and related) that fix the described vulnerabilities. Users of Red Hat Enterprise Linux 10 and its variants should apply these official updates promptly. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigations are indicated beyond applying the vendor-provided patches.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:7672
- Cve Count
- 5
- Additional Cves
- ["CVE-2026-5732","CVE-2026-5734","CVE-2026-33416","CVE-2026-33636"]
- Cvss Version
- null
Threat ID: 6a160984e29bf47b50650e82
Added to database: 05/26/2026, 20:58:44 UTC
Last enriched: 07/23/2026, 00:58:32 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 62
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