RHSA-2026:26269 — Security Advisory

Red Hat Security Advisory: thunderbird security update

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Severity

Important

Red Hat Product Security

RHEL 9

Products

Official CSAF product identity

Published · June 16, 2026

Updated · July 28, 2026

Topic

An update for thunderbird is now available for Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.

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.