{"schemaVersion":3,"id":"USN-6087-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"ruby2.3, ruby2.5, ruby2.7 vulnerabilities\n\nIt was discovered that Ruby incorrectly handled certain regular expressions.\nAn attacker could possibly use this issue to cause a denial of service.\n(CVE-2023-28755)\n\nIt was discovered that Ruby incorrectly handled certain regular expressions.\nAn attacker could possily use this issue to cause a denial of service.\nThis issue only affected Ubuntu 16.04 ESM. (CVE-2023-28756)","dates":{"published":"2023-05-18T09:35:29.000Z","modified":"2026-06-25T13:32:03.994Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":null,"severity":"unknown","version":null,"versionLabel":null,"source":null,"vector":null,"computed":false,"selection":"none"},"metrics":[]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"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":[],"affected":[{"vendor":"ubuntu","product":"ruby2.3","name":"ruby2.3","label":"ruby2.3","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/ruby2.3","purlType":"deb","versions":[{"text":"< 2.3.1-2~ubuntu16.04.16+esm7","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.3.1-2~ubuntu16.04.16+esm7","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"ruby2.5","name":"ruby2.5","label":"ruby2.5","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/ruby2.5","purlType":"deb","versions":[{"text":"< 2.5.1-1ubuntu1.16","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.5.1-1ubuntu1.16","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"ruby2.7","name":"ruby2.7","label":"ruby2.7","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/ruby2.7","purlType":"deb","versions":[{"text":"< 2.7.0-5ubuntu1.11","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.7.0-5ubuntu1.11","eol":null,"hubHref":null}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-6087-1","label":"ubuntu.com/security/notices/USN-6087-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2023-28755","label":"ubuntu.com/security/CVE-2023-28755","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2023-28756","label":"ubuntu.com/security/CVE-2023-28756","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2023-28755","CVE-2023-28756"],"downstream":[],"duplicates":[],"related":["CVE-2023-28755","CVE-2023-28756"]},"timeline":[{"kind":"published","date":"2023-05-18T09:35:29.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-25T13:32:03.994Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":0,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T14:42:56.778Z","stale":false,"partial":false}}