{"id":"CVE-2026-123201","summary":"buku through 5.1.1 SSRF via bukuserver fetch_data and network_handle API","details":"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.","modified":"2026-11-05T21:32:23.269538592Z","published":"2026-11-05T18:16:37.726Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-918"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/123xxx/CVE-2026-123201.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/123xxx/CVE-2026-123201.json"},{"type":"PACKAGE","url":"https://github.com/jarun/buku"},{"type":"ARTICLE","url":"https://github.com/jarun/buku/blob/e232ac357cbba22fe69d6d6dfc0d35512a4cd313/buku.py#L4057-L4084"},{"type":"ARTICLE","url":"https://github.com/jarun/buku/blob/e232ac357cbba22fe69d6d6dfc0d35512a4cd313/bukuserver/api.py#L97-L105"},{"type":"FIX","url":"https://github.com/jarun/buku/commit/13f6497afc974f02f1069b760772abe8815d1675"},{"type":"REPORT","url":"https://github.com/jarun/buku/issues/910"},{"type":"FIX","url":"https://github.com/jarun/buku/pull/916"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123201"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/buku-through-5.1.1-ssrf-via-bukuserver-fetch-data-and-network-handle-api"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/jarun/buku","events":[{"introduced":"0"},{"last_affected":"e232ac357cbba22fe69d6d6dfc0d35512a4cd313"},{"fixed":"13f6497afc974f02f1069b760772abe8815d1675"}],"database_specific":{"extracted_events":[{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"0"},{"last_affected":"5.1.1"}]},{"source":"REFERENCES_COMMIT","range":[{"fixed":"13f6497afc974f02f1069b760772abe8815d1675"}]}]}}],"versions":["v5.1.1","v5.1","pre-bootstrap4","v5.0","v4.9","v4.8","v4.7","v4.6","v4.5","v4.4","v4.3","v4.2.2","v4.2","v4.2.1","v4.1","v4.0","v3.9","v3.8","v3.7","v3.6","v3.5","v3.4","v3.3.1","v3.3","v3.2","v3.1","v3.0","v2.9","v2.8","v2.7","v2.6","v2.5","v2.4","v2.3","v2.2","v2.1","v2.0","1.9","1.8","1.7","1.6","1.5","1.4","1.2","1.1","1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-123201.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N"}]}