Type conversion in FreeRDP - #VU156172
Published: October 19, 2026
Vulnerability identifier: #VU156172
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-704
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service by terminating a FreeRDP client process.
The vulnerability exists due to an incorrect type conversion in the rfx_rlgr_decode function in libfreerdp/codec/rfx_rlgr.c when decoding server-supplied tile data with RemoteFX surface decoding enabled. A remote attacker can trick a victim into connecting to a malicious RDP server and send a crafted RemoteFX tileset containing RLGR code 32767 to trigger an assertion during the conversion of code + 1 to int16_t and terminate the client process.
The process-terminating assertion depends on the build configuration and requires WITH_VERBOSE_WINPR_ASSERT to be enabled.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - update to 3.32.2