CVE-2026-56297

Description

FreeRDP before 3.22.0 contains a use-after-free vulnerability in dvcman_channel_close and dvcman_call_on_receive due to improper synchronization of channel_callback access. A malicious RDP server can trigger a race condition by sending DYNVC_DATA and DYNVC_CLOSE messages concurrently, causing heap-use-after-free in the drdynvc client thread and potentially enabling remote code execution or denial of service.

CVSS Vector

References

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h
• https://www.vulncheck.com/advisories/freerdp-use-after-free-via-race-condition-in-drdynvc-channel-callback
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h