Infinite loop in FreeRDP - #VU146583
Published: September 1, 2026
Vulnerability identifier: #VU146583
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-835
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an infinite loop in pool_decode_rect when processing AVC444 or AVC444v2 graphics updates with numRegionRects greater than work_object_count in threaded decode mode. A remote attacker can send a specially crafted RDP graphics metablock to cause a denial of service.
User interaction is required because the victim must connect to a malicious or compromised RDP server. The issue is reachable only in the threaded AVC444 client decode path when useThreads is enabled and the EXTGPU fast-path is not active.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - update to 3.31.0