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CVE-2026-22856

Freerdp use-after-free

8.1 HIGHPublic exploitEPSS 0.33%
  1. Published14 Jan 2026

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a race in the serial channel IRP thread tracking allows a heap use‑after‑free when one thread removes an entry from serial->IrpThreads while another reads it. This vulnerability is fixed in 3.20.1.

CVSS 3.1 breakdown

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

Affected products

Freerdp< 3.20.1

Remediation

Fixed in
Freerdp≥ 3.20.1

References

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Frequently asked

Is CVE-2026-22856 being actively exploited?

CVE-2026-22856 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.33%.

How severe is CVE-2026-22856?

CVE-2026-22856 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.33% probability of exploitation.

Which products are affected by CVE-2026-22856?

Affected products include Freerdp.

How do I fix CVE-2026-22856?

Upgrade affected software to a fixed version, for example Freerdp 3.20.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-22856 against the real software inventory on every managed device, as each hourly inventory arrives. 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.