RHSA-2025:1133 — Security Advisory

An update for firefox is now available for Red Hat Enterprise Linux 8.2 Advanced Update Support.

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.

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 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbird 128.7 (CVE-2025-1017)

• firefox: thunderbird: Use-after-free in Custom Highlight (CVE-2025-1010)

• firefox: thunderbird: Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 115.20, and Thunderbird 128.7 (CVE-2025-1016)

• firefox: thunderbird: Potential opening of private browsing tabs in normal browsing windows (CVE-2025-1013)

• firefox: thunderbird: A bug in WebAssembly code generation could result in a crash (CVE-2025-1011)

• firefox: thunderbird: Use-after-free in XSLT (CVE-2025-1009)

• firefox: thunderbird: Certificate length was not properly checked (CVE-2025-1014)

• firefox: thunderbird: Use-after-free during concurrent delazification (CVE-2025-1012)

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.