Heap-based buffer overflow in FreeRDP - #VU138641
Published: July 20, 2026
Vulnerability identifier: #VU138641
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/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 execute arbitrary code.
The vulnerability exists due to integer overflow leading to a heap-based buffer overflow in the Audio Input Redirection virtual channel ALSA backend when processing a crafted FramesPerPacket value in MSG_SNDIN_OPEN or MSG_SNDIN_FORMATS messages. A remote attacker can send a specially crafted RDP server message to execute arbitrary code.
User interaction is required to connect to a malicious or compromised RDP server with audio input redirection enabled.
Affected software
FreeRDP
Remediation
Install security update from vendor's website.
FreeRDP - update to 3.29.0