Red Hat Security Advisory: thunderbird security update
Multiple security vulnerabilities have been identified in Mozilla Thunderbird and associated libraries, including libpng and Firefox components. These include arbitrary code execution due to a use-after-free vulnerability, information disclosure and denial of service via out-of-bounds read/write, memory safety bugs, and an integer overflow in the graphics text component. Red Hat has issued an important security advisory with updates for Thunderbird in Red Hat Enterprise Linux 8 to address these issues.
AI Analysis
Technical Summary
This advisory covers several vulnerabilities affecting Mozilla Thunderbird and related components in Red Hat Enterprise Linux 8. The issues include a use-after-free vulnerability in libpng (CVE-2026-33416) that could lead to arbitrary code execution, out-of-bounds read/write in libpng's Neon palette expansion causing information disclosure and denial of service (CVE-2026-33636), multiple memory safety bugs fixed in Firefox ESR and Thunderbird ESR versions 140.9.1 and 149.0.2 (CVE-2026-5731, CVE-2026-5734), and an integer overflow in the graphics text component affecting Firefox and Thunderbird (CVE-2026-5732). Red Hat has released updated Thunderbird packages (version 140.9.1-1.el8_10) for various architectures to remediate these vulnerabilities.
Potential Impact
The vulnerabilities collectively could allow attackers to execute arbitrary code, cause denial of service, or disclose sensitive information via memory safety issues and integer overflow bugs in Thunderbird and its dependencies. The presence of a use-after-free vulnerability is particularly critical as it can lead to arbitrary code execution. Memory safety bugs and integer overflow issues may also compromise application stability and security.
Mitigation Recommendations
Red Hat has released updated Thunderbird packages (version 140.9.1-1.el8_10) for Red Hat Enterprise Linux 8 and its Extended Life Cycle variants across multiple architectures. Users should apply these official updates to remediate the vulnerabilities. For detailed update instructions, refer to the Red Hat advisory at https://access.redhat.com/articles/11258. No additional mitigation steps are specified or required beyond applying the provided security update.
Red Hat Security Advisory: thunderbird security update
Description
Multiple security vulnerabilities have been identified in Mozilla Thunderbird and associated libraries, including libpng and Firefox components. These include arbitrary code execution due to a use-after-free vulnerability, information disclosure and denial of service via out-of-bounds read/write, memory safety bugs, and an integer overflow in the graphics text component. Red Hat has issued an important security advisory with updates for Thunderbird in Red Hat Enterprise Linux 8 to address these issues.
Affected software
pkg:rpm/redhat/thunderbirdRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This advisory covers several vulnerabilities affecting Mozilla Thunderbird and related components in Red Hat Enterprise Linux 8. The issues include a use-after-free vulnerability in libpng (CVE-2026-33416) that could lead to arbitrary code execution, out-of-bounds read/write in libpng's Neon palette expansion causing information disclosure and denial of service (CVE-2026-33636), multiple memory safety bugs fixed in Firefox ESR and Thunderbird ESR versions 140.9.1 and 149.0.2 (CVE-2026-5731, CVE-2026-5734), and an integer overflow in the graphics text component affecting Firefox and Thunderbird (CVE-2026-5732). Red Hat has released updated Thunderbird packages (version 140.9.1-1.el8_10) for various architectures to remediate these vulnerabilities.
Potential Impact
The vulnerabilities collectively could allow attackers to execute arbitrary code, cause denial of service, or disclose sensitive information via memory safety issues and integer overflow bugs in Thunderbird and its dependencies. The presence of a use-after-free vulnerability is particularly critical as it can lead to arbitrary code execution. Memory safety bugs and integer overflow issues may also compromise application stability and security.
Mitigation Recommendations
Red Hat has released updated Thunderbird packages (version 140.9.1-1.el8_10) for Red Hat Enterprise Linux 8 and its Extended Life Cycle variants across multiple architectures. Users should apply these official updates to remediate the vulnerabilities. For detailed update instructions, refer to the Red Hat advisory at https://access.redhat.com/articles/11258. No additional mitigation steps are specified or required beyond applying the provided security 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-2026:9345
- Cve Count
- 5
- Additional Cves
- ["CVE-2026-5732","CVE-2026-5734","CVE-2026-33416","CVE-2026-33636"]
- Cvss Version
- null
Threat ID: 6a160984e29bf47b506508b9
Added to database: 05/26/2026, 20:58:44 UTC
Last enriched: 07/23/2026, 00:57:50 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 64
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