{"schemaVersion":3,"id":"USN-8563-4","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"nginx regression\n\nUSN-8563-3 fixed a vulnerability in nginx. The fix introduced a regression\nin certain environments. This update reverts the fix for CVE-2026-42533\npending further investigation.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n It was discovered that nginx incorrectly handled certain map directives\n using regex matching and capture variables. A remote attacker could use\n this issue to cause nginx to crash, resulting in a denial of service, or\n possibly execute arbitrary code. (CVE-2026-42533)\n\n It was discovered that nginx had a use-after-free vulnerability in the\n ngx_http_ssi_module module when configured with Server-Side Includes,\n proxy_pass, and proxy buffering disabled directives. An attacker able to\n intercept traffic and control responses from an upstream server could\n possibly use this issue to cause nginx to crash, resulting in a denial of\n service. (CVE-2026-56434)\n\n It was discovered that nginx incorrectly handled certain requests in the\n ngx_http_slice_module module. A remote attacker could possibly use this\n issue to obtain sensitive information or cause nginx to crash, resulting\n in a denial of service. (CVE-2026-60005)","dates":{"published":"2026-08-19T19:30:43.000Z","modified":"2026-08-20T05:15:04.273Z","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":"nginx","name":"nginx","label":"nginx","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/nginx","purlType":"deb","versions":[{"text":"< 1.18.0-6ubuntu14.20","noFixRecorded":false,"fixedIn":null},{"text":"< 1.24.0-2ubuntu7.17","noFixRecorded":false,"fixedIn":null},{"text":"< 1.28.3-2ubuntu1.10","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.18.0-6ubuntu14.20 | < 1.24.0-2ubuntu7.17 | < 1.28.3-2ubuntu1.10","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-8563-4","label":"ubuntu.com/security/notices/USN-8563-4","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://bugs.launchpad.net/bugs/2164558","label":"bugs.launchpad.net/bugs/2164558","hostname":"bugs.launchpad.net","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":["CVE-2026-42533"]},"timeline":[{"kind":"published","date":"2026-08-19T19:30:43.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-08-20T05:15:04.273Z","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":"2026-10-19T16:33:19.110Z","stale":false,"partial":false}}