Vulnerability in Freerdp
CVE-2026-91955
FreeRDP before 3.31.0 fails to validate client-supplied DesktopWidth and DesktopHeight values during GCC negotiation, allowing remote attackers to crash the server. Attackers can send crafted RDP packets with zero or oversized dimensions to trigger division-by-zero or assertion failures in multifragment update capability calculations, terminating the server process.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4464-r7qj-pgrx (Exploit, vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/freerdp-before-3.31.0-denial-of-service-via-deskto… (Exploit, Third Party Advisory, Mitigation, third-party-advisory)
Frequently asked questions
- What is CVE-2026-91955?
- CVE-2026-91955 is a high-severity vulnerability in Freerdp, classified under Divide By Zero. CVSS score: 7.5/10. Published 2026-09-15.
- How severe is CVE-2026-91955?
- High severity. CVSS v3 base score is 7.5 out of 10.