What’s Vulnerable › Vulnerabilities

CVE-2026-67305: FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-08-01 · updated 2026-09-08
• Weakness: CWE-122

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.

Affected products

• FreeRDP: before 3.29.0 — fixed in 3.29.0

How to fix

Upgrade to a fixed version: FreeRDP 3.29.0. Check the vendor advisory for mitigations.

References

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cj9v-h4hq-29jr
• https://www.vulncheck.com/advisories/freerdp-windows-client-before-heap-buffer-overflow-via-cliprdr
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cj9v-h4hq-29jr

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