CVE-2026-73108
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk42th percentile - higher than 42% of all known CVEs
Summary
RustDesk before version 1.4.7 has an uncontrolled speculative memory allocation vulnerability in BytesCodec. Before authentication, the decoder trusts the payload length in the frame header and reserves memory before receiving data, allowing memory exhaustion via multiple TCP connections.
Risk Assessment
An unauthenticated attacker can cause memory exhaustion and denial of service, making the application unavailable.
Recommendation
Update RustDesk to version 1.4.7 or later. Limit the number of concurrent connections to reduce risk.
Other vulnerabilities in RustDesk
See all- CVE-2026-73102Medium
RustDesk versions 1.3.9 through 1.4.9 contain a path traversal vulnerability in the macOS clipboard file-paste code path. A remote peer can write files outside the intended target directory using parent-directory components or absolute paths.
- CVE-2026-76840Critical
RustDesk's Windows clipboard redirection copies a peer-supplied length into a fixed-size caller buffer without an upper bound check. When an OLE paste consumer such as explorer.exe calls IStream::Read with a buffer of cb bytes, CliprdrStream_Read in libs/clipboard/src/windows/wf_cliprdr.c requests that many bytes of a remote file through cliprdr_send_request_filecontents and then executes CopyMemory(pv, clipboard->req_fdata, clipboard->req_fsize), where req_fsize is taken verbatim from the peer's CLIPRDR FileContentsResponse by wf_cliprdr_server_file_contents_response (req_fsize = fileContentsResponse->cbRequested) and is never clamped to cb anywhere in the chain. The function's only length comparison, req_fsize < cb, handles the short-read case and is evaluated after the copy has already occurred. A malicious or compromised peer that answers a small file-contents read with an oversized response therefore writes attacker-chosen data past the end of the paste consumer's heap buffer when the local user pastes clipboard file contents offered by the remote side.
- CVE-2026-57850High
RustDesk before version 1.4.9 does not enforce the authorized connection scope of a session on the server side. An authenticated remote peer with a limited session type (FileTransfer, PortForward, ViewCamera, or Terminal) can send control messages and login options reserved for a full Remote session.
- CVE-2026-58056High
A vulnerability in RustDesk allows a peer with only FileTransfer authorization to inject keyboard and mouse input and access unguarded screenshot and display-capture handlers. This occurs because incoming control messages are gated on per-capability flags, and a file-transfer session does not clear those flags.
Original NVD description (English source)
RustDesk versions before 1.4.7 contain an uncontrolled speculative memory allocation vulnerability in BytesCodec. Before authentication, the decoder trusts the payload length encoded in a four-byte frame header and reserves that amount before receiving the payload. A crafted header can request up to 1,073,741,823 bytes of capacity, allowing unauthenticated attackers to use concurrent TCP connections to cause memory exhaustion and denial of service. The fix caps header-triggered speculative preallocation at 256 KiB.