Medium severity6.5NVD Advisory· Published Sep 15, 2026

CVE-2026-91961

Description

FreeRDP before 3.31.0 contains a denial-of-service vulnerability in the URBDRC control-transfer request path that fails to validate OutputBufferSize before forwarding to the libusb backend. A malicious RDP server can send a control-transfer request with OutputBufferSize set to 65536, triggering a reachable assertion that terminates the client process.

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Affected products

Freerdp/Freerdpllm-fuzzy
Range: <3.31.0

Patches

Vulnerability mechanics

References

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-w9qg-g24r-77f6nvd
www.vulncheck.com/advisories/freerdp-before-3.31.0-denial-of-service-via-urbdrcnvd

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cvss	0.423
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000