Hi, You are receiving an AlmaLinux Security update email because you subscribed to receive errata notifications from AlmaLinux. AlmaLinux: 9 Type: Security Severity: Important Release date: 2026-05-29 Summary: Mozilla Thunderbird is a standalone mail and newsgroup client. Security Fix(es): * firefox: Incorrect boundary conditions in the JavaScript Engine: JIT component (CVE-2026-8388) * firefox: Other issue in the JavaScript Engine component (CVE-2026-8391) * firefox: Sandbox escape in the Profile Backup component (CVE-2026-8401) * firefox: Integer overflow in the Networking: JAR component (CVE-2026-8956) * firefox: Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151 (CVE-2026-8975) * firefox: Privilege escalation in the DOM: Workers component (CVE-2026-8955) * firefox: Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component (CVE-2026-8968) * firefox: Incorrect boundary conditions, integer overflow in the Audio/Video component (CVE-2026-8954) * firefox: Information disclosure, sandbox escape in the Security: Process Sandboxing component (CVE-2026-8958) * firefox: Incorrect boundary conditions in the Audio/Video: Web Codecs component (CVE-2026-8946) * firefox: Privilege escalation in the Security component (CVE-2026-8970) * firefox: Same-origin policy bypass in the Networking: HTTP component (CVE-2026-8950) * firefox: Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151 (CVE-2026-8974) * firefox: Sandbox escape due to use-after-free in the Disability Access APIs component (CVE-2026-8953) * firefox: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component (CVE-2026-8959) * firefox: Spoofing issue in the Form Autofill component (CVE-2026-8961) * firefox: Use-after-free in the DOM: Bindings (WebIDL) component (CVE-2026-8947) * firefox: Mitigation bypass in the DOM: Security component (CVE-2026-8962) * firefox: Privilege escalation in the Enterprise Policies component (CVE-2026-8957) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Full details, updated packages, references, and other related information: https://errata.almalinux.org/9/ALSA-2026-21381.html This message is automatically generated, please don’t reply. For further questions, please, contact us via the AlmaLinux community chat: https://chat.almalinux.org/. Want to change your notification settings? Sign in and manage mailing lists on https://lists.almalinux.org. Kind regards, AlmaLinux Team