Vulnerability · Published Oct 12, 2026 · Assigned by VulnCheck

CVE-2026-109240FreeRDP 3.11.0 before 3.32.1 Reachable Assertion DoS via urb_isoch_transfer

Low 3.1

In plain English

A low-severity security flaw in FreeRDP from FreeRDP. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)3.1Low

Exploit odds (30 days)0.3%top 81.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	freerdp2	no fix listed	DEBIAN-CVE-2026-109240
Debian:13	freerdp3	no fix listed	DEBIAN-CVE-2026-109240
Debian:14	freerdp3	3.32.1+dfsg-1	DEBIAN-CVE-2026-109240
Ubuntu:22.04:LTS	freerdp2	no fix listed	UBUNTU-CVE-2026-109240
Ubuntu:24.04:LTS	freerdp3	3.32.1+dfsg-0ubuntu0.24.04.1	UBUNTU-CVE-2026-109240
Ubuntu:26.04:LTS	freerdp3	3.32.1+dfsg-0ubuntu0.26.04.1	UBUNTU-CVE-2026-109240

Affected products (as reported)

Vendor	Product	Versions
FreeRDP	FreeRDP	3.11.0 – before 3.32.1

Weakness: CWE-617 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L

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_transfer third-party-advisory