Skip to content
EXYS
Back to the CVEs

CVE-2026-121958

7.5, high

FreeRDP Heap-based Buffer Overflow Vulnerability

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
0.3% higher than 28.1% of scored CVEs
Exploitation
Exploit code published
Published
4 Nov 20262 days ago

Description

FreeRDP through 3.32.1 has a heap out-of-bounds write in the RDPGFX client because the delete_surface callback truncates surface hash keys to 16 bits, leaving the surface table inconsistent so HashTable_GetKeys writes past its allocated key array. A malicious or man-in-the-middle RDP server can exploit this by creating surfaceId 0xFFFF, closing the RDPGFX channel, sending repeated DELETESURFACE PDUs, and then sending ENDFRAME or RESETGRAPHICS.

Details

Vendor
FreeRDP
Product
FreeRDP
Weakness
CWE-122 (opens in a new tab)
Status
Analyzed
Updated
5 Nov 2026
Assigner
disclosure@vulncheck.com

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

References 2

Exploit code 1

Advisories 1

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-2026-121957 FreeRDP Race Condition Vulnerability EPSS 0.3% 7, high
  • CVE-2026-121386 FreeRDP before 3.32.2 contains a denial of service vulnerability in WinPR's winpr_read_png_from_buffer() and winpr_convert_from_jpeg(),… EPSS 0.3% 7.5, high
  • CVE-2026-114045 FreeRDP Heap-based Buffer Overflow Vulnerability EPSS 0.6% 8.8, high
  • CVE-2026-111880 FreeRDP Out-of-Bounds Write Vulnerability EPSS 0.3% 7.4, high
  • CVE-2026-111881 FreeRDP Integer Underflow Vulnerability EPSS 0.2% 7.6, high
  • CVE-2026-111378 FreeRDP Uncontrolled Resource Consumption Vulnerability EPSS 0.5% 7.5, high
  • CVE-2026-111379 FreeRDP Heap-based Buffer Overflow Vulnerability EPSS 0.2% 7.3, high
  • CVE-2026-111380 FreeRDP Integer Overflow Vulnerability EPSS 0.3% 8.8, high

Beyond this page

Is CVE-2026-121958 in your network?

This page tells you how dangerous CVE-2026-121958 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-2026-121958 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 6 Nov 2026, not the live upstream state.