{"affected":[{"defaultStatus":"unaffected","ecosystem":"pypi","packageName":"buku","product":"buku","source":"CNA: VulnCheck","vendor":"jarun","versions":[{"lessThanOrEqual":"5.1.1","status":"affected","version":"0","versionType":"custom"}]}],"cveId":"CVE-2026-123201","cwes":["CWE-918"],"description":"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.","epss":{"date":"2026-11-09","percentile":0.33914,"score":0.00394},"exploits":[],"kev":null,"metrics":[{"score":6.3,"severity":"medium","source":"CNA: VulnCheck","vector":"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","version":"4.0"},{"score":5.3,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},{"score":6.3,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"},{"score":5.3,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}],"modifiedAt":1794246319136,"publishedAt":1793902597726,"references":[{"source":"CNA: VulnCheck","tags":["issue-tracking"],"url":"https://github.com/jarun/buku/issues/910"},{"source":"CNA: VulnCheck","tags":["patch","issue-tracking"],"url":"https://github.com/jarun/buku/pull/916"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/jarun/buku/commit/13f6497afc974f02f1069b760772abe8815d1675"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/jarun/buku/blob/e232ac357cbba22fe69d6d6dfc0d35512a4cd313/bukuserver/api.py#L97-L105"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/jarun/buku/blob/e232ac357cbba22fe69d6d6dfc0d35512a4cd313/buku.py#L4057-L4084"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/buku-through-5.1.1-ssrf-via-bukuserver-fetch-data-and-network-handle-api"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/jarun/buku/blob/e232ac357cbba22fe69d6d6dfc0d35512a4cd313/buku.py#L4057-L4084"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/jarun/buku/blob/e232ac357cbba22fe69d6d6dfc0d35512a4cd313/bukuserver/api.py#L97-L105"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/jarun/buku/commit/13f6497afc974f02f1069b760772abe8815d1675"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/jarun/buku/issues/910"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/jarun/buku/pull/916"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/buku-through-5.1.1-ssrf-via-bukuserver-fetch-data-and-network-handle-api"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/jarun/buku/pull/916"},{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/jarun/buku/commit/13f6497afc974f02f1069b760772abe8815d1675"}],"revision":"8d628da5233a7471ecbdf3cc244fe871f6d472ab32343ea8767128bf8b9b8696","sources":[{"modifiedAt":1794246319136,"name":"CNA: VulnCheck","retrievedAt":1794247812553,"url":"https://www.cve.org/CVERecord?id=CVE-2026-123201"},{"modifiedAt":1793906239153,"name":"NVD","retrievedAt":1793946366376,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123201"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794247812932,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-123201"}],"ssvc":{"assessedAt":1794245737598,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"buku through 5.1.1 SSRF via bukuserver fetch_data and network_handle API","updatedAt":1794247812932}