CVE-2026-67305

CRITICAL

FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr

Title source: cna

Description

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.

References (2)

Core 2

Core References

Third Party Advisory third-party-advisory

VulnCheck Advisory: FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr

https://www.vulncheck.com/advisories/freerdp-windows-client-before-heap-buffer-overflow-via-cliprdr

Vendor Advisory vendor-advisory

GitHub Security Advisory (GHSA-cj9v-h4hq-29jr)

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cj9v-h4hq-29jr

Scores

CVSS v4 9.4

EPSS 0.0049

EPSS Percentile 39.6%

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact total

Details

CWE

CWE-122

Status published

Products (2)

FreeRDP/FreeRDP < 3.29.0

FreeRDP/FreeRDP 3.29.0

Published Aug 01, 2026

Tracked Since Aug 01, 2026