{"schemaVersion":3,"id":"USN-7365-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"nltk vulnerabilities\n\nIt was discovered that NLTK contained a regex that is susceptible to\ncatastrophic backtracking. An attacker could possibly use this issue to\ncause a denial of service. (CVE-2021-3842, CVE-2021-43854)","dates":{"published":"2025-03-24T01:55:52.000Z","modified":"2026-06-25T13:32:19.437Z","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":"nltk","name":"nltk","label":"nltk","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/nltk","purlType":"deb","versions":[{"text":"< 2.0~b9-0ubuntu4.1~esm4","noFixRecorded":false,"fixedIn":null},{"text":"< 3.1-1ubuntu0.1+esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 3.2.5-1ubuntu0.1+esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 3.4.5-2ubuntu0.1~esm2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.0~b9-0ubuntu4.1~esm4 | < 3.1-1ubuntu0.1+esm2 | < 3.2.5-1ubuntu0.1+esm2 | < 3.4.5-2ubuntu0.1~esm2","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-7365-1","label":"ubuntu.com/security/notices/USN-7365-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-3842","label":"ubuntu.com/security/CVE-2021-3842","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2021-43854","label":"ubuntu.com/security/CVE-2021-43854","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2021-3842","CVE-2021-43854"],"downstream":[],"duplicates":[],"related":["CVE-2021-3842","CVE-2021-43854"]},"timeline":[{"kind":"published","date":"2025-03-24T01:55:52.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-25T13:32:19.437Z","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":"2026-10-19T18:15:19.623Z","stale":false,"partial":false}}