Heap-based buffer overflow in FreeRDP - #VU164457
Published: November 10, 2026
Vulnerability identifier: #VU164457
CSH Severity: Medium
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to corrupt heap memory and crash a connected FreeRDP client.
The vulnerability exists due to a heap-based buffer overflow in FreeRDP's Progressive codec when tile-cache growth fails after the recorded capacity has already been increased. A remote attacker can operate a malicious RDP server and send Progressive graphics commands that exhaust available memory to leave the capacity check inconsistent with the allocated buffer and trigger an out-of-bounds write that corrupts memory and crashes the client.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - update to 3.33.0