RHSA-2026:4439 - Security Advisory

Topic

An update for freerdp is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

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

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. The xfreerdp client can connect to RDP servers such as Microsoft Windows machines, xrdp, and VirtualBox.

Security Fix(es):

• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22855)
• freerdp: FreeRDP global-buffer-overflow (CVE-2026-22858)
• freerdp: FreeRDP heap-buffer-overflow (CVE-2026-22859)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support Extension 8.4 x86_64
• Red Hat Enterprise Linux Server - AUS 8.4 x86_64

Fixes

• BZ - 2429645 - CVE-2026-22855 freerdp: FreeRDP heap-buffer-overflow
• BZ - 2429649 - CVE-2026-22858 freerdp: FreeRDP global-buffer-overflow
• BZ - 2429653 - CVE-2026-22859 freerdp: FreeRDP heap-buffer-overflow

CVEs

• CVE-2026-22855
• CVE-2026-22858
• CVE-2026-22859

References

• https://access.redhat.com/security/updates/classification/#important