CVE-2026-109240

FreeRDP 3.11.0 before 3.32.1 Reachable Assertion DoS via urb_isoch_transfer

State: Published
Severity: 2.3 Low
Published: Oct 12, 2026
Updated: Oct 13, 2026
Reserved: Oct 12, 2026

Description

FreeRDP 3.11.0 before 3.32.1 contains a reachable assertion vulnerability in urb_isoch_transfer that allows malicious RDP servers to crash clients by sending unvalidated OutputBufferSize values. Attackers can send a TS_URB_ISOCH_TRANSFER IN-direction request with OutputBufferSize above INT32_MAX over URBDRC, triggering an assertion in libusb_udev_isoch_transfer that terminates the client.

Scores

CVSS	Score	Vector	Source
4.0	2.3 Low	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N	VulnCheck
3.1	3.1 Low	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L	VulnCheck

Weaknesses

CWE-617 Reachable Assertion

Affected Products

Product	Versions
FreeRDPFreeRDP	3.11.0 to before 3.32.1Affected 3.32.1Not affected

References

GitHub Security Advisory (GHSA-9qqc-m43j-g4r2)vendor-advisory
VulnCheck Advisory: FreeRDP 3.11.0 before 3.32.1 Reachable Assertion DoS via urb_isoch_transferthird-party-advisory

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