What is CVE-2026-67305?

CVE-2026-67305 is a high-severity vulnerability in Freerdp, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-08-01.

How severe is CVE-2026-67305?

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

Buffer overflow in Freerdp

CVE-2026-67305

FreeRDP Windows client before 3.29.0 contains a heap buffer overflow vulnerability in the clipboard virtual channel when processing CLIPRDR_FILE_CONTENTS_RESPONSE PDUs without validating the server-provided size against the destination buffer. A malicious RDP server can send a response with a data payload significantly larger than requested, causing arbitrary heap memory corruption that may enable remote code execution when a user performs a paste operation.

Vulnerability class: Buffer Overflow

EPSS: 0.005 (44.2th 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, 3.29.0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

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

Frequently asked questions

What is CVE-2026-67305?: CVE-2026-67305 is a high-severity vulnerability in Freerdp, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-08-01.
How severe is CVE-2026-67305?: High severity. CVSS v3 base score is 8.8 out of 10.