CVE-2026-91955

High

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.

SeverityHigh

CVSS7.5

Exploit probability47. percentile0.6%

ProductFreerdp

PublishedSep 15, 2026

First seenSep 15, 2026

Weakness typeCWE-369CWE-369

How to fix

Update

freerdp freerdp3.31.0 or later

Vendor advisories

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4464-r7qj-pgrx

Affected products

Product	Affected versions	Fixed in
freerdp freerdp	v < 3.31.0	3.31.0

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