CVE-2026-49138 Details
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.
A server-side request forgery (SSRF) vulnerability has been identified in Nanobot versions prior to 0.2.1. This vulnerability resides in the web_fetch tool, where remote attackers can access internal or private network hosts. Exploitation involves supplying a URL that redirects to a loopback or private address via a 3xx Location header. The vulnerability takes advantage of the httpx library's automatic HTTP redirect following behavior, allowing attackers to bypass initial URL validation. As a result, outbound requests are sent to internal hosts before the final resolved URL is validated.
Users can upgrade to Nanobot version 0.2.1 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 1, 2026CISA-ADP
Assessed Jun 2, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/HKUDS/nanobot/pull/3928 | CISA-ADP | Issue TrackingVendor |
| https://github.com/HKUDS/nanobot/commit/545294c62c0947da40eb5b65288aaf02b5fdf632 | [email protected] | Source CodeVendor |
| https://github.com/HKUDS/nanobot/pull/3928 | [email protected] | Issue TrackingVendor |
| https://github.com/HKUDS/nanobot/releases/tag/v0.2.1 | [email protected] | Release NotesVendor |
| https://www.vulncheck.com/advisories/nanobot-ssrf-via-web-fetch-tool-redirect-following | [email protected] | AdvisoryBundleRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| HKUDS Nanobot | < 0.2.1 (semver) |
CPE
Remediation
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Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 22, 2026 | CVE Translated | [email protected] |
| Jul 14, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 2, 2026 | CVE Modified | CISA-ADP |
| Jun 1, 2026 | New CVE Received | [email protected] |