Auth bypass in Nanocoai Nanoclaw
CVE-2026-17434
A flaw has been found in nanocoai NanoClaw up to 2.0.64. Affected is the function handleAddMcpServer of the file src/modules/self-mod/request.ts of the component add_mcp_server. Executing a manipulation can lead to improper authorization. The attack may be launched remotely. The exploit has been published and may be used. This patch is called e5b928783d5c485637565eb07d2967922dfbf8d8. A patch should be applied to remediate this issue.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (31.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Nanocoai Nanoclaw — versions 2.0.0, 2.0.1, 2.0.2
Weakness classification (CWE)
References
- vuldb.com/vuln/383075 (technical-description, vdb-entry)
- vuldb.com/vuln/383075/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-17434 (third-party-advisory)
- vuldb.com/submit/862451 (third-party-advisory)
- github.com/nanocoai/nanoclaw/issues/2762 (issue-tracking, exploit)
- github.com/nanocoai/nanoclaw/pull/2998 (issue-tracking, patch)
- github.com/nanocoai/nanoclaw/commit/e5b928783d5c485637565eb07d2967922dfbf8d8 (patch)
- github.com/nanocoai/nanoclaw/ (product)
Frequently asked questions
- What is CVE-2026-17434?
- CVE-2026-17434 is a medium-severity vulnerability in Nanocoai Nanoclaw, classified under Incorrect Privilege Assignment. CVSS score: 6.3/10. Published 2026-07-26.
- How severe is CVE-2026-17434?
- Medium severity. CVSS v3 base score is 6.3 out of 10.