What is CVE-2026-109240?

CVE-2026-109240 is a low-severity vulnerability in Freerdp, classified under Reachable Assertion. CVSS score: 3.1/10. Published 2026-10-12.

How severe is CVE-2026-109240?

Low severity. CVSS v3 base score is 3.1 out of 10.

Vulnerability in Freerdp

CVE-2026-109240

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.

Published 2026-10-12.

CVSS v3 metric

CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Freerdp

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9qqc-m43j-g4r2 (vendor-advisory)
www.vulncheck.com/advisories/freerdp-3.11.0-before-3.32.1-reachable-assertion-d… (third-party-advisory)

Frequently asked questions

What is CVE-2026-109240?: CVE-2026-109240 is a low-severity vulnerability in Freerdp, classified under Reachable Assertion. CVSS score: 3.1/10. Published 2026-10-12.
How severe is CVE-2026-109240?: Low severity. CVSS v3 base score is 3.1 out of 10.