{"id":"UBUNTU-CVE-2026-58404","details":"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.","modified":"2026-07-09T17:17:00.185008034Z","published":"2026-07-06T20:16:00Z","upstream":["CVE-2026-58404"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-58404"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-58404"},{"type":"REPORT","url":"https://github.com/gohugoio/hugo/security/advisories/GHSA-r46f-3rpw-hxrv"},{"type":"REPORT","url":"https://github.com/gohugoio/hugo/pull/15020"},{"type":"REPORT","url":"https://github.com/gohugoio/hugo/commit/a00b5c72ac57afe26df6688ece3ca544a56df372"},{"type":"REPORT","url":"https://github.com/gohugoio/hugo/releases/tag/v0.163.1"}],"affected":[{"package":{"name":"hugo","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/hugo?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.15+git20160109.147.dd1d655-1","0.15+git20160109.147.dd1d655-2","0.15+git20160128.179.5def6d9-1","0.15+git20160206.203.ed23711-1"],"ecosystem_specific":{"binaries":[{"binary_name":"golang-github-spf13-hugo-dev","binary_version":"0.15+git20160206.203.ed23711-1"},{"binary_name":"hugo","binary_version":"0.15+git20160206.203.ed23711-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-58404.json"}},{"package":{"name":"hugo","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/hugo?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.25.1-2","0.26-1","0.35-1","0.37.1-1","0.38-1","0.39-1","0.40-1","0.40.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"golang-github-gohugoio-hugo-dev","binary_version":"0.40.1-1"},{"binary_name":"hugo","binary_version":"0.40.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-58404.json"}},{"package":{"name":"hugo","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/hugo?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.57.2-1","0.58.3-1","0.59.1-1.1","0.68.3-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.68.3-1","binary_name":"hugo"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-58404.json"}},{"package":{"name":"hugo","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/hugo?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.80.0-6","0.89.4-2","0.90.0-1","0.90.1-1","0.91.0-1","0.91.2-1","0.92.0-1","0.92.1-1build1","0.92.2-1","0.92.2-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"hugo","binary_version":"0.92.2-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-58404.json"}},{"package":{"name":"hugo","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/hugo?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.113.0-3","0.119.0-2","0.120.3-1","0.120.4-1","0.121.2-1","0.122.0-1","0.123.7-1build1","0.123.7-1ubuntu0.1","0.123.7-1ubuntu0.2","0.123.7-1ubuntu0.2+esm1","0.123.7-1ubuntu0.3","0.123.7-1ubuntu0.3+esm1","0.123.7-1ubuntu0.3+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"hugo","binary_version":"0.123.7-1ubuntu0.3+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-58404.json"}},{"package":{"name":"hugo","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/hugo?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.131.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"hugo","binary_version":"0.131.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-58404.json"}},{"package":{"name":"hugo","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/hugo?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.131.0-1","0.152.2-1","0.153.1-3","0.153.2-1","0.154.2-2","0.154.3-1","0.154.5-1"],"ecosystem_specific":{"binaries":[{"binary_name":"hugo","binary_version":"0.154.5-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-58404.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"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"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}