What is CVE-2026-91963?

CVE-2026-91963 is a medium-severity vulnerability in Freerdp, classified under CWE-457. CVSS score: 6.5/10. Published 2026-09-15.

How severe is CVE-2026-91963?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Freerdp

CVE-2026-91963

FreeRDP versions before 3.31.0 contain an uninitialized heap memory disclosure vulnerability in the urbdrc USB redirection channel. A malicious RDP server can induce failing USB transfers to read uninitialized heap memory from the client, defeating ASLR and enabling remote code execution when chained with memory corruption vulnerabilities.

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:H/I:N/A:N.

Affected products

Freerdp

Weakness classification (CWE)

CWE-457

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-91963?: CVE-2026-91963 is a medium-severity vulnerability in Freerdp, classified under CWE-457. CVSS score: 6.5/10. Published 2026-09-15.
How severe is CVE-2026-91963?: Medium severity. CVSS v3 base score is 6.5 out of 10.