Out-of-bounds read in FreeRDP - #VU164445
Published: November 10, 2026
Vulnerability identifier: #VU164445
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to trigger reads beyond a heap allocation in the FreeRDP client.
The vulnerability exists due to an out-of-bounds read in the smartcard channel when an odd-length mszGroups buffer is consumed without a WCHAR-aligned NUL terminator. A remote attacker can complete the RDP handshake with a client using /smartcard and send an SCARD_IOCTL_LISTREADERSW request with cBytes=1 and a non-NULL mszGroups containing 'E' to trigger the heap overread.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - update to 3.33.0