CVE-2026-22856: FreeRDP has a heap-use-after-free in create_irp_thread

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-01-14 · updated 2026-06-17
Weakness: CWE-362

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.

Affected products

FreeRDP: before 3.20.1 — fixed in 3.20.1

How to fix

Upgrade to a fixed version: FreeRDP 3.20.1. Check the vendor advisory for mitigations.

References

https://github.com/FreeRDP/FreeRDP/releases/tag/3.20.1
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-w842-c386-fxhv

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