SSRF in Hkuds Nanobot
CVE-2026-49138
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (29.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.004 · change: -0.001
Affected products
- Hkuds Nanobot — versions 0
Weakness classification (CWE)
References
- github.com/HKUDS/nanobot/releases/tag/v0.2.1 (release-notes)
- github.com/HKUDS/nanobot/pull/3928 (issue-tracking)
- github.com/HKUDS/nanobot/commit/545294c62c0947da40eb5b65288aaf02b5fdf632 (patch)
- www.vulncheck.com/advisories/nanobot-ssrf-via-web-fetch-tool-redirect-following (third-party-advisory)
Frequently asked questions
- What is CVE-2026-49138?
- CVE-2026-49138 is a medium-severity vulnerability in Hkuds Nanobot, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.0/10. Published 2026-06-01.
- How severe is CVE-2026-49138?
- Medium severity. CVSS v3 base score is 5.0 out of 10.