CVE-2026-17434 nanocoai NanoClaw add_mcp_server request.ts handleAddMcpServer improper authorization
Attackers can bypass authorization in NanoClaw's add_mcp_server function to perform unauthorized actions, requiring a patch for remediation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-17434?
CVE-2026-17434 is a medium-severity missing authorization vulnerability in nanocoai NanoClaw, published on 26 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-17434?
How do I fix CVE-2026-17434?
No fix has been published for CVE-2026-17434 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-17434 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-17434 exists.
Sources
Also known as GHSA-m5r3-634q-m3rj.