FreeRDP Windows client before 3.29.0 contains a heap buffer overflow vulnerability in the clipboard virtual channel when processing… (CVE-2026-67305)
FreeRDP Windows client versions before 3.29.0 contain a heap buffer overflow vulnerability in the clipboard virtual channel. This occurs when processing CLIPRDR_FILE_CONTENTS_RESPONSE PDUs without validating the size of server-provided data against the destination buffer. A malicious RDP server can exploit this by sending an oversized data payload, causing heap memory corruption. This may enable remote code execution when a user performs a paste operation.
AI Analysis
Technical Summary
The vulnerability in FreeRDP Windows client prior to version 3.29.0 is a heap buffer overflow in the clipboard virtual channel. It arises from improper validation of the size of CLIPRDR_FILE_CONTENTS_RESPONSE PDUs sent by the server. An attacker controlling an RDP server can send a response with a data payload larger than expected, leading to arbitrary heap memory corruption. This flaw can be exploited to achieve remote code execution on the client side when the user pastes clipboard contents. The issue is tracked as CVE-2026-67305 and classified under CWE-122 (Heap-based Buffer Overflow).
Potential Impact
Successful exploitation allows a malicious RDP server to cause arbitrary heap memory corruption on the client, potentially leading to remote code execution when a user performs a paste operation. This compromises the confidentiality, integrity, and availability of the affected system.
Mitigation Recommendations
A fix is available in FreeRDP version 3.29.0. Users should upgrade to version 3.29.0 or later to remediate this vulnerability. No other mitigation guidance is provided or required.
FreeRDP Windows client before 3.29.0 contains a heap buffer overflow vulnerability in the clipboard virtual channel when processing… (CVE-2026-67305)
Description
FreeRDP Windows client versions before 3.29.0 contain a heap buffer overflow vulnerability in the clipboard virtual channel. This occurs when processing CLIPRDR_FILE_CONTENTS_RESPONSE PDUs without validating the size of server-provided data against the destination buffer. A malicious RDP server can exploit this by sending an oversized data payload, causing heap memory corruption. This may enable remote code execution when a user performs a paste operation.
CVSS v4.0
Affected software
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in FreeRDP Windows client prior to version 3.29.0 is a heap buffer overflow in the clipboard virtual channel. It arises from improper validation of the size of CLIPRDR_FILE_CONTENTS_RESPONSE PDUs sent by the server. An attacker controlling an RDP server can send a response with a data payload larger than expected, leading to arbitrary heap memory corruption. This flaw can be exploited to achieve remote code execution on the client side when the user pastes clipboard contents. The issue is tracked as CVE-2026-67305 and classified under CWE-122 (Heap-based Buffer Overflow).
Potential Impact
Successful exploitation allows a malicious RDP server to cause arbitrary heap memory corruption on the client, potentially leading to remote code execution when a user performs a paste operation. This compromises the confidentiality, integrity, and availability of the affected system.
Mitigation Recommendations
A fix is available in FreeRDP version 3.29.0. Users should upgrade to version 3.29.0 or later to remediate this vulnerability. No other mitigation guidance is provided or required.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-3w26-2cxg-pvh3
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-67305"]
- Ecosystems
- []
- Database Specific Severity
- CRITICAL
- Cvss Version
- 4.0
Threat ID: 6a6e6298bf32cb7a344f9d14
Added to database: 08/01/2026, 21:18:16 UTC
Last enriched: 08/01/2026, 21:24:00 UTC
Last updated: 08/02/2026, 01:28:03 UTC
Views: 3
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.