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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.007 (51.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-hw7p-5h2r-83gq (vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/freerdp-2.0.0-through-3.30.0-uninitialized-heap-me… (Third Party Advisory, 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.