High severity7.5NVD Advisory· Published Sep 15, 2026

CVE-2026-91955

Description

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.

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Affected products

Freerdp/Freerdpllm-fuzzy
Range: <3.31.0

Patches

Vulnerability mechanics

References

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4464-r7qj-pgrxnvd
www.vulncheck.com/advisories/freerdp-before-3.31.0-denial-of-service-via-desktop-dimensionsnvd

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cvss	0.488
epss	0.000
exploit	0.000
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patch	-0.070
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