RHSA-2026:19811 - 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 Moderate. 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: Denial of service due to use-after-free vulnerability (CVE-2026-25952)
• freerdp: FreeRDP: Denial of Service via double free vulnerability during disconnect (CVE-2026-26986)
• freerdp: FreeRDP: Denial of Service via endless blocking loop in Stream_EnsureCapacity (CVE-2026-27951)
• freerdp: FreeRDP has a heap-buffer-overflow in bitmap_cache_put via OOB cacheId (CVE-2026-29775)
• freerdp: FreeRDP has an out-of-bounds read in ADPCM decoders due to missing predictor/step_index bounds checks (CVE-2026-31885)
• freerdp: FreeRDP has a division-by-zero in ADPCM decoders when `nBlockAlign` is 0 (CVE-2026-31884)
• freerdp: FreeRDP: Denial of Service via crafted audio data in RDP (CVE-2026-31883)
• FreeRDP: FreeRDP: Information disclosure via heap memory out of bounds read (CVE-2026-33985)

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 - 2442768 - CVE-2026-25952 freerdp: FreeRDP: Denial of service due to use-after-free vulnerability
• BZ - 2442782 - CVE-2026-26986 freerdp: FreeRDP: Denial of Service via double free vulnerability during disconnect
• BZ - 2442783 - CVE-2026-27951 freerdp: FreeRDP: Denial of Service via endless blocking loop in Stream_EnsureCapacity
• BZ - 2447379 - CVE-2026-29775 freerdp: FreeRDP has a heap-buffer-overflow in bitmap_cache_put via OOB cacheId
• BZ - 2447383 - CVE-2026-31885 freerdp: FreeRDP has an out-of-bounds read in ADPCM decoders due to missing predictor/step_index bounds checks
• BZ - 2447385 - CVE-2026-31884 freerdp: FreeRDP has a division-by-zero in ADPCM decoders when `nBlockAlign` is 0
• BZ - 2447386 - CVE-2026-31883 freerdp: FreeRDP: Denial of Service via crafted audio data in RDP
• BZ - 2453217 - CVE-2026-33985 FreeRDP: FreeRDP: Information disclosure via heap memory out of bounds read

CVEs

• CVE-2026-25952
• CVE-2026-26986
• CVE-2026-27951
• CVE-2026-29775
• CVE-2026-31883
• CVE-2026-31884
• CVE-2026-31885
• CVE-2026-33985

References

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