RHSA-2026:22643 — Security Advisory

Red Hat Security Advisory: thunderbird security update

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Severity

Important

Red Hat Product Security

RHEL 8

Products

Official CSAF product identity

Published · June 3, 2026

Updated · July 28, 2026

Topic

An update for thunderbird is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

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.