Is CVE-2026-17434 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-17434 being exploited in the wild.

How severe is CVE-2026-17434?

Medium severity, with a CVSS score of 6.3, published 26 July 2026.

Which products and versions are affected?

nanocoai NanoClaw up to 2.0.64.

Is there a fix for CVE-2026-17434?

A patch was published on 2026-07-13: Fix merged in commit e5b928783d5c485637565eb07d2967922dfbf8d8 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-17434 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-17434?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-17434: nanocoai NanoClaw improper authorization in add_mcp_server

CVE-2026-17434 · Severity: medium · CVSS 6.3 · Published 2026-07-26

nanocoai NanoClaw, a tool for running AI agents in secure containers, contains a flaw in how it handles administrative approvals for new server connections. An attacker-controlled agent can trick an administrator into approving a seemingly safe server connection while secretly including hidden commands or environment variables. If approved, these hidden settings are saved and executed, allowing the agent to bypass security boundaries and potentially gain unauthorized access to the host system.

Quick answers

Is CVE-2026-17434 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-17434 being exploited in the wild.
How severe is CVE-2026-17434?: Medium severity, with a CVSS score of 6.3, published 26 July 2026.
Which products and versions are affected?: nanocoai NanoClaw up to 2.0.64.
Is there a fix for CVE-2026-17434?: A patch was published on 2026-07-13: Fix merged in commit e5b928783d5c485637565eb07d2967922dfbf8d8 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-17434 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-17434?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An improper authorization vulnerability exists in NanoClaw's `handleAddMcpServer` function within `src/modules/self-mod/request.ts`. The application implements an approval flow for adding Model Context Protocol (MCP) servers, but the human-readable approval prompt only renders the `name` and `command` fields. An attacker-controlled agent can submit a request containing malicious `args` and `env` fields which are hidden from the approver but remain part of the persisted payload. Upon approval, `applyAddMcpServer` persists these hidden fields into the runtime configuration (`container.json`), leading to unauthorized command execution or environment manipulation. The issue was addressed in commit e5b9287 by splitting the handler into validation and hold-builder phases that ensure all payload components are properly capped and rendered for the approver.

Affected products

nanocoai NanoClaw up to 2.0.64

Timeline

2026-07-13: patched: Fix merged in commit e5b928783d5c485637565eb07d2967922dfbf8d8
2026-07-26: advisory: CVE published via VulDB/NVD

References

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