Vulnerability in Freerdp
CVE-2026-91951
FreeRDP versions before 3.31.0 contain an out-of-bounds write vulnerability in the urbdrc client channel's urb_send_current_frame_number_result() function. A malicious RDP server can send a crafted 28-byte USB redirection message to trigger a 4-byte write past the allocated 16-byte buffer, causing denial of service when verbose asserts are enabled.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
Affected products
Weakness classification (CWE)
References
- disclosure@vulncheck.com (vendor-advisory)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-91951?
- CVE-2026-91951 is a medium-severity vulnerability in Freerdp, classified under Reachable Assertion. CVSS score: 6.5/10. Published 2026-09-15.
- How severe is CVE-2026-91951?
- Medium severity. CVSS v3 base score is 6.5 out of 10.