CVE-2026-123201

CVSS 6.3 (medium) · published 2026-11-05

Buku (bukuserver) through 5.1.1 contains an unauthenticated server-side request forgery vulnerability that allows remote attackers to make the server request internal hosts by supplying a url parameter to /api/fetch_data or /api/network_handle. Attackers can target loopback, private, or cloud metadata IP addresses, which pass the weak is_bad_url() check and follow redirects, to discover internal services and read their page titles, descriptions, and keywords.

Weakness: CWE-918

Source: NVD CVE-2026-123201

References

• https://github.com/jarun/buku/blob/e232ac357cbba22fe69d6d6dfc0d35512a4cd313/buku.py#L4057-L4084
• https://github.com/jarun/buku/blob/e232ac357cbba22fe69d6d6dfc0d35512a4cd313/bukuserver/api.py#L97-L105
• https://github.com/jarun/buku/commit/13f6497afc974f02f1069b760772abe8815d1675
• https://github.com/jarun/buku/issues/910
• https://github.com/jarun/buku/pull/916
• https://www.vulncheck.com/advisories/buku-through-5.1.1-ssrf-via-bukuserver-fetch-data-and-network-handle-api

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