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CVE-2026-56297

Freerdp remote code execution

7.0 HIGHPublic exploitEPSS 0.47%
  1. Published8 Jul 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityLow
IntegrityLow
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H

Affected products

Freerdp< 3.22.0

Remediation

Fixed in
Freerdp≥ 3.22.0

References

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Frequently asked

Is CVE-2026-56297 being actively exploited?

CVE-2026-56297 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.47%.

How severe is CVE-2026-56297?

CVE-2026-56297 has a CVSS 3.1 base score of 7.0, rated high. EPSS estimates a 0.47% probability of exploitation.

Which products are affected by CVE-2026-56297?

Affected products include Freerdp.

How do I fix CVE-2026-56297?

Upgrade affected software to a fixed version, for example Freerdp 3.22.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-56297 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.