CVE-2026-91951

Summary

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.

Affected Software

Weaknesses

• CWE-617: Reachable Assertion

References

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-h5w2-q35j-443h
• https://www.vulncheck.com/advisories/freerdp-3.14.0-through-3.30.0-out-of-bounds-write-via-urbdrc

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