{"action":"Upgrade nltk to 3.9.4 or later.","affected":[{"fixed":"3.9.4","introduced":"0"}],"component":"nltk","cve_ids":["CVE-2026-70626"],"ecosystem":"PyPI","epss":0.002,"exploited":false,"fixed_versions":["3.9.4"],"ghsa_id":"GHSA-r6gq-whwq-mvg9","id":"tcs_01M5KH715FYJKH41WYT6MBK5RZ","modified_at":"2026-09-01T09:15:04.067655457Z","published_at":"2026-08-22T15:16:21.100Z","references":["https://osv.dev/vulnerability/PYSEC-2026-3732","https://www.vulncheck.com/advisories/nltk-before-symlink-escape-via-corpusreader","https://github.com/nltk/nltk/security/advisories/GHSA-r6gq-whwq-mvg9"],"severity":{"label":"medium","score":6.2},"sources":[{"source":"osv","source_id":"PYSEC-2026-3732","url":"https://osv.dev/vulnerability/PYSEC-2026-3732"},{"source":"nvd","source_id":"CVE-2026-70626","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-70626"}],"summary":"NLTK versions before 3.9.4 contain a symlink escape vulnerability in CorpusReader.open() that allows local attackers to read arbitrary files outside the corpus root. The vulnerability exists because p"}