High severity7.5NVD Advisory· Published Sep 15, 2026· Updated Sep 24, 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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Freerdp/Freerdp2 versions
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*range: <3.31.0
- (no CPE)range: <3.31.0

Patches

Vulnerability mechanics

References

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4464-r7qj-pgrxnvdExploitVendor Advisory
www.vulncheck.com/advisories/freerdp-before-3.31.0-denial-of-service-via-desktop-dimensionsnvdExploitMitigationThird Party Advisory

News mentions

FreeRDP: 20 Vulnerabilities Disclosed, Including Critical RDSTLS Bypass
Vypr Intelligence · Sep 15, 2026

cvss	0.488
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000