{"action":"Upgrade nltk to 3.10.3 or later.","affected":[{"fixed":"3.10.3","introduced":"0"}],"component":"nltk","cve_ids":["CVE-2026-81727"],"ecosystem":"PyPI","epss":0.00187,"exploited":false,"fixed_versions":["3.10.3"],"ghsa_id":"GHSA-f794-5jv7-7672","id":"tcs_01M5KH72JT3ZRY428968PTKDKJ","modified_at":"2026-09-01T09:15:03.611585308Z","published_at":"2026-08-27T17:21:03.533Z","references":["https://osv.dev/vulnerability/PYSEC-2026-3741","https://www.vulncheck.com/advisories/nltk-before-3.10.3-hardlink-file-overwrite-via-downloader","https://github.com/nltk/nltk/security/advisories/GHSA-f794-5jv7-7672"],"severity":{"label":"high","score":7.1},"sources":[{"source":"osv","source_id":"PYSEC-2026-3741","url":"https://osv.dev/vulnerability/PYSEC-2026-3741"},{"source":"nvd","source_id":"CVE-2026-81727","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81727"}],"summary":"NLTK versions before 3.10.3 contain a filesystem containment bypass vulnerability in the Downloader.download and Downloader.incr_download methods that allows attackers to overwrite files outside the i"}