CVE-2026-17434

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreHIGH confidence

Score 6.3 from GitHub Security Advisory (severity: LOW) published 2026-07-26. the CNA's CVSS baseline 6.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vuldb, epss, ghsa
Trending — 5 sources updated this weekElevated
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.3
EG Score
6.3(high)
EG Risk
28(Track)
EG Risk 28/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity63% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
12%
KEV
Not listed

Published

July 26, 2026

Last Modified

July 27, 2026

Advisory Details (3)

Auto-updated Jul 26, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

GitHub - nanocoai/nanoclaw: A lightweight alternative to OpenClaw that runs in containers for security. Connects to WhatsApp, Telegram, Slack, Discord, Gmail and other messaging apps,, has memory, scheduled jobs, and runs directly on Anthropic's Agents SDK · GitHub

https://github.com/nanocoai/nanoclaw/
github_pr

fix(self-mod): render full MCP server payload on the approval card

Fix merged in nanocoai/nanoclaw PR #2998 on 2026-07-13 — awaiting tagged release

https://github.com/nanocoai/nanoclaw/pull/2998
generic

[Security] NanoClaw `add_mcp_server` approval flow allows hidden `args` and `env` to be approved and persisted without being shown to the approver · Issue #2762 · nanocoai/nanoclaw · GitHub

https://github.com/nanocoai/nanoclaw/issues/2762

Vendor Advisories for CVE-2026-17434(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 12× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-27 15:31 UTCEG score recompute
  2. 2026-07-27 15:31 UTCGHSA enrichment
  3. 2026-07-27 15:30 UTCMITRE cvelistV5CVSS v4 → 5.3
  4. 2026-07-27 14:13 UTCEPSS rescore
  5. 2026-07-27 03:09 UTCEG score recompute
  6. 2026-07-27 03:09 UTCGHSA enrichment
  7. 2026-07-26 14:54 UTCEPSS rescore
  8. 2026-07-26 14:54 UTCEPSS rescore
  9. 2026-07-26 04:35 UTCEG score recompute
  10. 2026-07-26 04:33 UTCNVD updateCVSS v4 → 2.1
  11. 2026-07-26 03:55 UTCEG score recompute
  12. 2026-07-26 03:54 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-17434?
CVE-2026-17434 is a medium vulnerability published on July 26, 2026. 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 addmcpserver. Executing a manipulation can lead to improper authorization. The attack may be launched remotely. The exploit has been…
When was CVE-2026-17434 disclosed?
CVE-2026-17434 was first published in the National Vulnerability Database on July 26, 2026, with the most recent update on July 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-17434 actively exploited?
CVE-2026-17434 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 88.0% of all scored CVEs.
What is the CVSS score of CVE-2026-17434?
CVE-2026-17434 has a CVSS v4.0 base score of 6.3 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-17434?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-17434, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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