{"schemaVersion":3,"id":"CVE-2026-58404","aliases":["UBUNTU-CVE-2026-58404","DEBIAN-CVE-2026-58404","GHSA-r46f-3rpw-hxrv","GO-2026-5606"],"status":"published","duplicateOf":null,"title":null,"description":"Hugo is a static site generator. From v0.162.0 through v0.163.0, the default security.http.urls policy denies requests to loopback, internal, and cloud-metadata IPv4 literals, but the deny rule only matched dotted-decimal notation, so alternate IPv4 encodings of the same addresses, including integer, hex, or octal, passed the policy. When a template passes an untrusted or data-derived URL to resources.GetRemote and the host platform uses the cgo system resolver, these encodings resolve to the blocked address, allowing build-time server-side requests to loopback and internal services, including the cloud-metadata endpoint in hosted or CI builds; the same check is reused on redirects, so the gap also applies to each redirect hop. This issue is fixed in v0.163.1.","dates":{"published":"2026-07-06T19:16:15.945Z","modified":"2026-07-07T15:08:53.514Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.8,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":4.6,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Ubuntu","score":4.6,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N","exploitability":null,"impact":null,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":6.8,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N","exploitability":5.9,"impact":6.7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":6.8,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N","exploitability":5.9,"impact":6.7,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Go","score":7.7,"severity":"high","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":4.6,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.8,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00368,"percentile":0.29222,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00368},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00368,"percentile":0.29222}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00368,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00368,"percentile":0.29222}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-918","name":"Server-Side Request Forgery (SSRF)","description":"The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/918.html"}],"affected":[{"vendor":"debian","product":"hugo","name":"hugo","label":"hugo","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/hugo","purlType":"deb","versions":[{"text":"< 0.165.0-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.165.0-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"hugo","name":"hugo","label":"hugo","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/hugo","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"gohugo","product":"hugo","name":"hugo","label":"hugo","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 0.162.0, < 0.163.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 0.162.0, < 0.163.1","eol":null,"hubHref":"/vendor/gohugo/hugo"},{"vendor":"gohugoio","product":"hugo","name":"hugo","label":"hugo","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ v0.162.0, < v0.163.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ v0.162.0, < v0.163.1","eol":null,"hubHref":"/vendor/gohugoio/hugo"},{"vendor":"github.com/gohugoio","product":"hugo","name":"github.com/gohugoio/hugo","label":"hugo","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/github.com/gohugoio/hugo","purlType":"golang","versions":[{"text":"≥ 0.162.0, < 0.163.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 0.162.0, < 0.163.1","eol":null,"hubHref":null}],"affectedCount":5,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/gohugoio/hugo/security/advisories/GHSA-r46f-3rpw-hxrv","label":"github.com/gohugoio/hugo/security/advisories/GHSA-r46f-3rpw-hxrv","hostname":"github.com","tags":["X Refsource CONFIRM","REPORT","WEB","Advisory","Mitigation","Vendor Advisory"]},{"url":"https://github.com/gohugoio/hugo/pull/15020","label":"github.com/gohugoio/hugo/pull/15020","hostname":"github.com","tags":["X Refsource MISC","REPORT","Issue Tracking"]},{"url":"https://github.com/gohugoio/hugo/commit/a00b5c72ac57afe26df6688ece3ca544a56df372","label":"github.com/gohugoio/hugo/commit/a00b5c72ac57afe26df6688ece3ca544a56df372","hostname":"github.com","tags":["X Refsource MISC","REPORT","FIX","Patch"]},{"url":"https://github.com/gohugoio/hugo/releases/tag/v0.163.1","label":"github.com/gohugoio/hugo/releases/tag/v0.163.1","hostname":"github.com","tags":["X Refsource MISC","REPORT","Release Notes"]},{"url":"https://ubuntu.com/security/CVE-2026-58404","label":"ubuntu.com/security/CVE-2026-58404","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-58404","label":"www.cve.org/CVERecord?id=CVE-2026-58404","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-58404","label":"security-tracker.debian.org/tracker/CVE-2026-58404","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://github.com/gohugoio/hugo","label":"github.com/gohugoio/hugo","hostname":"github.com","tags":["PACKAGE"]}],"lineage":{"upstream":[],"downstream":["RHSA-2026:36862"],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-07-06T19:16:15.945Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-07-07T15:08:53.514Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":27,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T08:00:48.436Z","stale":false,"partial":false}}