CVE-2026-68579 Details
Description
FreeRDP before 3.30.0 (<= 3.29.0) contains a heap-based buffer overflow in the Windows clipboard client's CliprdrStream_Read function (client/Windows/wf_cliprdr.c). When an OLE paste consumer (e.g. explorer.exe) calls IStream::Read with a fixed-size buffer of cb bytes, CliprdrStream_Read requests file contents from the RDP server and then copies the response into the caller's buffer using the server-supplied length (req_fsize) instead of cb. A malicious or compromised RDP server can return an oversized CB_FILECONTENTS_RESPONSE, causing an out-of-bounds write of attacker-controlled data into the paste consumer's heap buffer when a user pastes server-offered clipboard file contents.
A heap-based buffer overflow vulnerability has been identified in FreeRDP versions prior to 3.30.0, specifically in the Windows clipboard client's CliprdrStream_Read function. This vulnerability arises when an OLE paste consumer, such as explorer.exe, uses the IStream::Read method with a fixed-size buffer. The CliprdrStream_Read function requests file contents from the RDP server and copies the response into the buffer using a server-controlled length, instead of the size specified by the consumer. As a result, a malicious or compromised RDP server can send an oversized response, leading to an out-of-bounds write of attacker-controlled data into the heap buffer of the paste consumer.
Users can update to FreeRDP version 3.30.0 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Aug 3, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-787 | Out-of-bounds Write | [email protected] |
Affected Products
No affected product data is available for this CVE.
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 3, 2026 | CVE Modified | CISA-ADP |
| Aug 2, 2026 | New CVE Received | [email protected] |