What is CVE-2026-40033?

CVE-2026-40033 is a high-severity vulnerability in Freerdp, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-05-26.

How severe is CVE-2026-40033?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Freerdp

CVE-2026-40033

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_M…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (21.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Freerdp — versions 0, 3.26.0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

disclosure@vulncheck.com (Exploit, vendor-advisory, Mitigation, Vendor Advisory)
disclosure@vulncheck.com (Patch, patch)
disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-40033?: CVE-2026-40033 is a high-severity vulnerability in Freerdp, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-05-26.
How severe is CVE-2026-40033?: High severity. CVSS v3 base score is 8.8 out of 10.