CVE-2026-24681: FreeRDP has a heap-use-after-free in urb_bulk_transfer_cb

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-09 · updated 2026-06-17
Weakness: CWE-416

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.22.0, aAsynchronous bulk transfer completions can use a freed channel callback after URBDRC channel close, leading to a use after free in urb_write_completion. This vulnerability is fixed in 3.22.0.

Affected products

FreeRDP: before 3.22.0 — fixed in 3.22.0

How to fix

Upgrade to a fixed version: FreeRDP 3.22.0. Check the vendor advisory for mitigations.

References

https://github.com/FreeRDP/FreeRDP/commit/414f701464929c217f2509bcbd6d2c1f00f7ed73
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-ccvv-hg2w-6x9j

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