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… (CVE-2026-109240)
Description
FreeRDP versions from 3.11.0 up to but not including 3.32.1 contain a reachable assertion vulnerability in the urb_isoch_transfer function. This flaw allows a malicious RDP server to crash the client by sending a specially crafted OutputBufferSize value that exceeds INT32_MAX. The vulnerability triggers an assertion failure in libusb_udev_isoch_transfer, causing client termination. The CVSS score is 3.1, indicating low severity, with no confidentiality or integrity impact, only availability impact due to client crash.
CVSS v3.1
Score 3.1low
Affected software
pkg:github/freerdp/FreeRDPRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-109240 describes a reachable assertion vulnerability in FreeRDP versions 3.11.0 before 3.32.1 within the urb_isoch_transfer function. A malicious RDP server can send a TS_URB_ISOCH_TRANSFER IN-direction request with an OutputBufferSize value exceeding INT32_MAX over the URBDRC channel. This input is not properly validated, leading to an assertion failure in libusb_udev_isoch_transfer that terminates the client process. The vulnerability results in a denial-of-service condition by crashing the FreeRDP client.
Potential Impact
The vulnerability allows a remote attacker controlling an RDP server to cause a denial-of-service by crashing the FreeRDP client. There is no impact on confidentiality or integrity. The crash occurs due to an assertion triggered by an unvalidated large OutputBufferSize value, resulting in client termination and loss of availability.
Mitigation Recommendations
A fix is available in FreeRDP version 3.32.1 and later. Users should upgrade to version 3.32.1 or newer to remediate this vulnerability. No other mitigations are indicated. Patch status is confirmed by the version range affected and fixed versions stated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-9xp7-4872-49v6
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-109240"]
- Database Specific Severity
- LOW
- Cvss Version
- 3.1
Threat ID: 6acd55532cdf04f656da855d
Added to database: 10/12/2026, 21:46:59 UTC
Last enriched: 10/12/2026, 21:58:33 UTC
Last updated: 10/13/2026, 02:08:26 UTC
Views: 4
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