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.

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.

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.

Affected products

Freerdp

Weakness classification (CWE)

CWE-369 — Divide By Zero

References

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