What is CVE-2026-56297?

CVE-2026-56297 is a high-severity vulnerability in Freerdp, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.0/10. Published 2026-07-08.

How severe is CVE-2026-56297?

High severity. CVSS v3 base score is 7.0 out of 10.

Vulnerability in Freerdp

CVE-2026-56297

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.

Vulnerability class: Race Condition

EPSS: 0.004 (29.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.0 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H.

Affected products

Freerdp — versions 0, 3.22.0

Weakness classification (CWE)

CWE-362 — Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)

References

disclosure@vulncheck.com (Exploit, vendor-advisory, Vendor Advisory)
disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-56297?: CVE-2026-56297 is a high-severity vulnerability in Freerdp, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.0/10. Published 2026-07-08.
How severe is CVE-2026-56297?: High severity. CVSS v3 base score is 7.0 out of 10.