MinorCritical vulnerability

CVE-2026-91951 (CVSS 7.1)

NVD · officialPublished Sep 15, 2026Risk 23/100EPSS 0.3%

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.

Technical details

CVSS

7.1

AV:NetworkAC:LowPR:NoneUI:Passive

Evidence and sources

This record is attributed to NVD. Exploitation status and remediation guidance are kept separate from the vulnerability's technical severity.

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