Skip to content
EXYS
Back to the CVEs

CVE-2026-91955

7.5, high

FreeRDP before 3.31.0 fails to validate client-supplied DesktopWidth and DesktopHeight values during GCC negotiation, allowing remote…

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.5, high high CVSS v3.1
EPSS, next 30 days
0.6% higher than 46% of scored CVEs
Exploitation
Exploit code published
Published
15 Sept 2026a month ago

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.

Details

Vendor
FreeRDP
Product
FreeRDP
Weakness
CWE-369 (opens in a new tab)
Status
Analyzed
Updated
24 Sept 2026
Assigner
disclosure@vulncheck.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References 2

Exploit code 2

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other FreeRDP CVEs

Every FreeRDP CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-111378 FreeRDP Uncontrolled Resource Consumption Vulnerability EPSS 0.3% 7.5, high
  • CVE-2026-111379 FreeRDP Heap-based Buffer Overflow Vulnerability EPSS 0.1% 7.3, high
  • CVE-2026-111380 FreeRDP Integer Overflow Vulnerability EPSS 0.3% 8.8, high
  • CVE-2026-111381 FreeRDP Heap-based Buffer Overflow Vulnerability EPSS 0.1% 7.3, high
  • CVE-2026-111382 FreeRDP Out-of-Bounds Write Vulnerability EPSS 0.3% 8.8, high
  • CVE-2026-110837 FreeRDP Heap-based Buffer Overflow Vulnerability EPSS 0.3% 7.1, high
  • CVE-2026-110838 FreeRDP Missing Authentication for Critical Function Vulnerability EPSS 0.3% 7.5, high
  • CVE-2026-110839 FreeRDP Out-of-Bounds Write Vulnerability EPSS 0.2% 7.1, high

Beyond this page

Is CVE-2026-91955 in your network?

This page tells you how dangerous CVE-2026-91955 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-91955 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.