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Description

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.

PUBLISHED Reserved 2026-05-27 | Published 2026-06-01 | Updated 2026-06-02 | Assigner VulnCheck




MEDIUM: 5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N

MEDIUM: 5.0CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Problem types

Server-Side Request Forgery (SSRF)

Product status

Default status
affected

Any version before 0.2.1
affected

Credits

Chia Min Jun Lennon finder

References

github.com/HKUDS/nanobot/pull/3928 exploit

github.com/HKUDS/nanobot/releases/tag/v0.2.1 release-notes

github.com/HKUDS/nanobot/pull/3928 issue-tracking

github.com/...ommit/545294c62c0947da40eb5b65288aaf02b5fdf632 patch

www.vulncheck.com/...f-via-web-fetch-tool-redirect-following third-party-advisory

cve.org (CVE-2026-49138)

nvd.nist.gov (CVE-2026-49138)

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