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CVE-2026-68579 is a heap-based buffer overflow in FreeRDP before 3.30.0, affecting the Windows clipboard client implementation in CliprdrStream_Read within wf_cliprdr.c. During clipboard virtual file transfer handling, an OLE paste consumer invokes IStream::Read with a caller-allocated buffer of cb bytes. The vulnerable code requests file contents from the remote RDP server and then copies the returned data into the caller buffer using the server-controlled length value req_fsize rather than enforcing the destination buffer size cb. Because a malicious or compromised server can return an oversized file-contents response, the copy operation can write past the end of the heap buffer owned by the local paste consumer. The flaw is triggered when the user pastes clipboard file contents offered by the remote side.
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The corresponding vulnerability identifier for the same clipboard redirection defect in FreeRDP's wf_cliprdr.c codebase.
A heap-based buffer overflow in FreeRDP's Windows clipboard redirection code caused by copying a peer-supplied length into a fixed-size caller buffer without properly bounding it to the requested read size.
A critical heap-based buffer overflow in FreeRDP's Windows clipboard client CliprdrStream_Read function that can let a malicious or compromised RDP server trigger an out-of-bounds write during clipboard file paste operations.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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