HKUDS nanobot up to 0.2.0 Outbound Requests server-side request forgery

Summaryinfo

A vulnerability identified as critical has been detected in HKUDS nanobot up to 0.2.0. Affected by this issue is some unknown functionality of the component Outbound Requests Handler. The manipulation leads to server-side request forgery. This vulnerability is referenced as CVE-2026-49138. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in HKUDS nanobot up to 0.2.0. It has been rated as critical. This issue affects some unknown functionality of the component Outbound Requests Handler. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Nanobot prior to version 0.2.1 contains a server-side request forgery vulnerability in the web_fetch tool that allows remote attackers to reach internal or private network hosts by supplying a URL that redirects to a loopback or private address via a 3xx Location header. Attackers can exploit the automatic HTTP redirect following behavior in the httpx library to bypass initial URL validation and cause the runtime to send outbound requests to internal hosts before final resolved URL validation is applied.

The weakness was published by Chia Min Jun Lennon. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-49138 since 05/27/2026. The exploitation is known to be easy. The attack may be initiated remotely. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 0.2.1 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 545294c62c0947da40eb5b65288aaf02b5fdf632 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• HKUDS

Name

• nanobot

Version

• 0.1
• 0.2.0

License

• open-source

Website

• Product: https://github.com/HKUDS/nanobot/

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