CVE-2026-44420 — FreeRDP cliprdr server heap-buffer-overflow via undersized capabilitySetLength in CB_CLIP_CAPS

Description (CNA)

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.26.0, a malicious RDP client can trigger a heap-buffer-overflow write in FreeRDP's server-side clipboard (cliprdr) channel by sending a CB_CLIP_CAPS PDU with a too-small capabilitySetLength. This can crash the server process (remote DoS) and may be exploitable for code execution because it corrupts heap memory. This vulnerability is fixed in 3.26.0.

Affected (CNA)

Vendor / product	Versions
FreeRDP / FreeRDP	affected < 3.26.0

CWE

CWE-122

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mvpx-xj7r-3p3r

ADP enrichment

CISA-ADP

No English description supplied.

https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-h6wq-j5mv-f3q8

redhat-SADP

A heap-buffer overflow vulnerability exists in the FreeRDP server's clipboard channel. A remote attacker can exploit this by sending a specially crafted message to the server, which can crash the service (Denial of Service) or potentially allow the attacker to execute arbitrary code.