CVE-2026-91961CWE-617

CVE-2026-91961

Medium · published September 15, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
29.9
In the wild
Unconfirmed
What it is

FreeRDP before 3.31.0 contains a denial-of-service vulnerability in the URBDRC control-transfer request path that fails to validate OutputBufferSize before forwarding to the libusb backend. A malicious RDP server can send a control-transfer request with OutputBufferSize set to 65536, triggering a reachable assertion that terminates the client process.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS v4.0
7.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00371 · 29.9th percentile
Weakness
CWE-617 · Reachable Assertion
Published
2026-09-15T20:17Z
Affected products (1)
ProductVersionsFixed in
freerdp/freerdp< 3.31.03.31.0
References (2)
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-w9qg-g24r-77f6 · [email protected]https://www.vulncheck.com/advisories/freerdp-before-3.31.0-denial-of-service-via-urbdrc · [email protected]
EPSS history
Timeline
  • 17 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 15 SEP 15:18Z
    FreeRDP before 3.31.0 Denial of Service via URBDRC
    cvelistv5