Red Hat Security Advisory: thunderbird security update
Multiple security vulnerabilities affecting Mozilla Thunderbird and related components have been addressed in a Red Hat security advisory. These include use-after-free, information disclosure, denial of service, memory safety bugs, and integer overflow issues impacting libpng, Thunderbird, and Firefox components. The vulnerabilities are fixed in Thunderbird ESR 140. 9. 1 and 149. 0. 2 versions as part of Red Hat Enterprise Linux 8. 4 updates. The advisory rates the impact as Important and provides updated packages to remediate these issues.
AI Analysis
Technical Summary
This Red Hat security advisory addresses several vulnerabilities in Mozilla Thunderbird and associated libraries, including libpng and Firefox components integrated with Thunderbird. The fixed issues include a use-after-free vulnerability (CVE-2026-33416) in libpng that could lead to arbitrary code execution, out-of-bounds read/write vulnerabilities (CVE-2026-33636) causing information disclosure and denial of service, memory safety bugs (CVE-2026-5731, CVE-2026-5734) in Thunderbird and Firefox ESR versions, and an integer overflow in the graphics text component (CVE-2026-5732). These vulnerabilities affect Red Hat Enterprise Linux 8.4 AppStream AUS and EUS extensions. The advisory provides updated Thunderbird packages (version 140.9.1) to address these issues.
Potential Impact
The vulnerabilities fixed include arbitrary code execution, information disclosure, denial of service, and memory safety issues, which could potentially allow attackers to compromise the affected system or disrupt service. The advisory classifies the security impact as Important, indicating a high risk but not necessarily critical. There are no known exploits in the wild at the time of the advisory.
Mitigation Recommendations
Red Hat has released updated Thunderbird packages for Red Hat Enterprise Linux 8.4 AUS and EUS extensions that address these vulnerabilities. Users should apply these official updates promptly to remediate the security issues. For detailed update instructions, refer to the Red Hat advisory at https://access.redhat.com/articles/11258. No additional mitigations are specified beyond applying the provided patches.
Red Hat Security Advisory: thunderbird security update
Description
Multiple security vulnerabilities affecting Mozilla Thunderbird and related components have been addressed in a Red Hat security advisory. These include use-after-free, information disclosure, denial of service, memory safety bugs, and integer overflow issues impacting libpng, Thunderbird, and Firefox components. The vulnerabilities are fixed in Thunderbird ESR 140. 9. 1 and 149. 0. 2 versions as part of Red Hat Enterprise Linux 8. 4 updates. The advisory rates the impact as Important and provides updated packages to remediate these issues.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This Red Hat security advisory addresses several vulnerabilities in Mozilla Thunderbird and associated libraries, including libpng and Firefox components integrated with Thunderbird. The fixed issues include a use-after-free vulnerability (CVE-2026-33416) in libpng that could lead to arbitrary code execution, out-of-bounds read/write vulnerabilities (CVE-2026-33636) causing information disclosure and denial of service, memory safety bugs (CVE-2026-5731, CVE-2026-5734) in Thunderbird and Firefox ESR versions, and an integer overflow in the graphics text component (CVE-2026-5732). These vulnerabilities affect Red Hat Enterprise Linux 8.4 AppStream AUS and EUS extensions. The advisory provides updated Thunderbird packages (version 140.9.1) to address these issues.
Potential Impact
The vulnerabilities fixed include arbitrary code execution, information disclosure, denial of service, and memory safety issues, which could potentially allow attackers to compromise the affected system or disrupt service. The advisory classifies the security impact as Important, indicating a high risk but not necessarily critical. There are no known exploits in the wild at the time of the advisory.
Mitigation Recommendations
Red Hat has released updated Thunderbird packages for Red Hat Enterprise Linux 8.4 AUS and EUS extensions that address these vulnerabilities. Users should apply these official updates promptly to remediate the security issues. For detailed update instructions, refer to the Red Hat advisory at https://access.redhat.com/articles/11258. No additional mitigations are specified beyond applying the 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-2026:14303
- Cve Count
- 5
- Additional Cves
- ["CVE-2026-5732","CVE-2026-5734","CVE-2026-33416","CVE-2026-33636"]
- Cvss Version
- null
Threat ID: 6a16097ee29bf47b5064afd2
Added to database: 5/26/2026, 8:58:38 PM
Last enriched: 5/26/2026, 10:34:45 PM
Last updated: 5/27/2026, 4:58:21 AM
Views: 2
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.