An update for thunderbird is now available for Red Hat Enterprise Linux 8.4
 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions, and Red Hat Enterprise Linux 8.4 Telecommunications Update Service.

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 Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

* firefox: thunderbird: Memory safety bugs fixed in Firefox 136, Thunderbird
 136, Firefox ESR 128.8, and Thunderbird 128.8 (CVE-2025-1938)

* firefox: thunderbird: Memory safety bugs fixed in Firefox 136, Thunderbird
 136, Firefox ESR 115.21, Firefox ESR 128.8, and Thunderbird 128.8 (CVE-2025-1937)

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.

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CVE-2025-1937: Buffer Copy without Checking Size of Input ('Classic Buffer
 Overflow') (CWE-120)
CVE-2025-1938: Buffer Copy without Checking Size of Input ('Classic Buffer
 Overflow') (CWE-120)