What’s Vulnerable › Vulnerabilities

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

• Severity: low (CVSS 3.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-12 · updated 2026-10-14
• Weakness: CWE-617

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 products

• FreeRDP: from 3.11.0 before 3.32.1 — fixed in 3.32.1

How to fix

Upgrade to a fixed version: FreeRDP 3.32.1. Check the vendor advisory for mitigations.

References

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9qqc-m43j-g4r2
• https://www.vulncheck.com/advisories/freerdp-3.11.0-before-3.32.1-reachable-assertion-dos-via-urb-isoch-transfer
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9qqc-m43j-g4r2

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