High severity · published Aug 1, 2026
CVE-2026-67305
FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr
8.8
CVSS
0.8%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 55% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FR
FreeRDP · FreeRDP
before 3.29.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-67305
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-67305
Exploit
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cj9v-h4hq-29jr
Third Party Advisory
https://www.vulncheck.com/advisories/freerdp-windows-client-before-heap-buffer-overflow-via-cliprdr
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