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 malic

highCVSS 7CVE-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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: high — CVSS 7
Published: 2026-07-08
Last updated: 2026-07-10
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-56297

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-562970.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 18% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-56297	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

medium[NEW] [medium] FreeRDP: Vulnerability allows code execution and denial of servicecert-bund

Recent advisories for FreeRDP

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-57158: FreeRDP is a free implementation of the Remote Desktop Protocol. From 3.21.0 before 3.28.0, Fr…nvd · 2026-07-10
mediumCVE-2026-57157: FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, FreeRDP serv…nvd · 2026-07-10
unknownCVE-2026-57156: FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0 on 32-bit bui…nvd · 2026-07-10
highCVE-2026-55827: FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.1, FreeRDP clie…nvd · 2026-07-10
high[NEW] [high] FreeRDP: Vulnerability allows code executioncert-bund · 2026-07-09
medium[NEW] [medium] FreeRDP: Vulnerability allows code execution and denial of servicecert-bund · 2026-07-09