PatchSiren cyber security CVE debrief
CVE-2026-56402 nanocoai CVE debrief
CVE-2026-56402 is a high-severity privilege escalation vulnerability in NanoClaw before version 2.1.17. The vulnerability is caused by a failure to verify the responder role authorization in the handleApprovalsResponse function. This allows attackers with a valid questionId to approve or reject privileged actions like package installation by submitting approval response payloads without proper role validation. The vulnerability has a CVSS score of 7.1 and is considered high severity. The CVE was published on June 23, 2026, and last modified on June 23, 2026.
- Vendor
- nanocoai
- Product
- nanoclaw
- CVSS
- HIGH 7.1
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-06-23
- Original CVE updated
- 2026-06-23
- Advisory published
- 2026-06-23
- Advisory updated
- 2026-06-23
Who should care
Organizations using NanoClaw before version 2.1.17 should be aware of this vulnerability and take steps to mitigate it. Specifically, administrators and security teams responsible for NanoClaw installations should prioritize patching to version 2.1.17 or later. Additionally, defenders should monitor for suspicious activity related to package installation and approval responses.
Technical summary
The handleApprovalsResponse function in NanoClaw before 2.1.17 fails to verify the responder role authorization, allowing attackers to escalate privileges. The vulnerability is triggered by submitting approval response payloads without proper role validation. The CVSS vector for this vulnerability is 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. The weakness associated with this vulnerability is CWE-862.
Defensive priority
High priority should be given to patching NanoClaw installations to version 2.1.17 or later. In the meantime, defenders should monitor for suspicious activity related to package installation and approval responses.
Recommended defensive actions
- Patch NanoClaw installations to version 2.1.17 or later
- Monitor for suspicious activity related to package installation and approval responses
- Implement additional access controls and role validation for package installation and approval responses
- Conduct regular security audits and vulnerability assessments
- Keep NanoClaw and related dependencies up-to-date
Evidence notes
The CVE-2026-56402 vulnerability was reported by Vulncheck and is publicly disclosed. The vulnerability is caused by a failure to verify the responder role authorization in the handleApprovalsResponse function. The CVE has a CVSS score of 7.1 and is considered high severity. The CVE was published on June 23, 2026, and last modified on June 23, 2026.
Official resources
This article is AI-assisted and based on the supplied source corpus.