RHSA-2026:21743 — Security Advisory

Red Hat Security Advisory: firefox security update

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Severity

Important

Red Hat Product Security

RHEL 9

Products

Official CSAF product identity

Published · May 28, 2026

Updated · July 28, 2026

Topic

An update for firefox is now available for Red Hat Enterprise Linux 9.0 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 Firefox is an open-source web browser, designed for standards compliance, performance, and portability.

Security Fix(es):

firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.10.1 and Firefox 150.0.1 (CVE-2026-7323)
firefox: thunderbird: Information disclosure due to incorrect boundary conditions in the Audio/Video component (CVE-2026-7320)
firefox: thunderbird: Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1 (CVE-2026-7322)
firefox: thunderbird: webrtc: Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component (CVE-2026-7321)

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.