Heap-based buffer overflow in FreeRDP - #VU139935
Published: July 28, 2026
Vulnerability identifier: #VU139935
CSH Severity: Low
CVSS v4: 7.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/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 user to cause a denial of service and perform out-of-bounds memory access.
The vulnerability exists due to a heap-based buffer overflow in kerberos_DecryptMessage when processing a peer-supplied GSS Wrap token during CredSSP/NLA. A remote user can send a specially crafted token with an oversized EC field to cause a denial of service and perform out-of-bounds memory access.
Exploitation requires a completed Kerberos NLA context, and both a malicious server to a client and an authenticated client to a server can reach the vulnerable code path.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - update to 3.30.0