{"id":"USN-9058-1","summary":"ruby-actionpack-page-caching vulnerability","details":"It was discovered that Action Pack Page Caching incorrectly handled certain\nrequest paths when writing cached pages. A remote attacker could possibly\nuse this issue to write arbitrary files to the web server, and possibly\nexecute arbitrary code.","modified":"2026-11-12T17:29:31.110890717Z","published":"2026-11-11T18:33:04Z","related":["UBUNTU-CVE-2020-8159"],"upstream":["CVE-2020-8159","UBUNTU-CVE-2020-8159"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-9058-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-8159"}],"affected":[{"package":{"name":"ruby-actionpack-page-caching","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/ruby-actionpack-page-caching?arch=source&distro=esm-apps-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.2-4ubuntu0.16.04.1~esm1"}]}],"versions":["1.0.2-3","1.0.2-4"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_name":"ruby-actionpack-page-caching","binary_version":"1.0.2-4ubuntu0.16.04.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9058-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"id":"CVE-2020-8159","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"score":"medium","type":"Ubuntu"}]}]}}},{"package":{"name":"ruby-actionpack-page-caching","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/ruby-actionpack-page-caching?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.2-4ubuntu0.18.04.1~esm1"}]}],"versions":["1.0.2-4"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_version":"1.0.2-4ubuntu0.18.04.1~esm1","binary_name":"ruby-actionpack-page-caching"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9058-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"id":"CVE-2020-8159","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"score":"medium","type":"Ubuntu"}]}]}}},{"package":{"name":"ruby-actionpack-page-caching","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/ruby-actionpack-page-caching?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.0-1ubuntu0.1~esm1"}]}],"versions":["1.1.0-1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"ruby-actionpack-page-caching","binary_version":"1.1.0-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9058-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2020-8159"}]}}}],"schema_version":"1.9.2"}