CVE•Published 2026-05-26•Modified 2026-07-27•1 article on news•6 live references•NVD data

CVE-2026-40033Freerdp · Freerdp

Vulnerability data via NVD (ingested)

CVSS v3.1

8.8

HIGH

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

EPSS percentile

Exploit Prediction Scoring System · top 43% of all CVEs

Weaknesses (CWE)

CWE-122Heap-based Buffer Overflow CWE-787Out-of-bounds Write

Description

FreeRDP before 3.26.0 contains a heap-buffer-overflow vulnerability in gdi_CacheToSurface that allows remote attackers to write out-of-bounds heap memory. The vulnerability occurs because rectangle validation clamps coordinates to UINT16_MAX but performs copy operations using unclamped cache entry dimensions, enabling malicious RDP servers to trigger large out-of-bounds writes and potentially achieve remote code execution or client crash.

Timeline

Published 2026-05-26

Modified 2026-07-27

External references

NVD MITRE Exploit-DB GitHub PoC trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-40033

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Freerdp Freerdp"

All exposed Freerdp Freerdp instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Freerdp"

HTTP body or banner mentions "Freerdp" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-40033