{"action":"Upgrade nltk to 3.10.0 or later.","affected":[{"fixed":"3.10.0","introduced":"0"}],"component":"nltk","cve_ids":["CVE-2026-63312"],"ecosystem":"PyPI","epss":0.00651,"exploited":false,"fixed_versions":["3.10.0"],"ghsa_id":"GHSA-x5ph-mj9p-rfr8","id":"tcs_01M5KH70W8BZASY57KJE53GWJQ","modified_at":"2026-09-01T09:15:04.067757501Z","published_at":"2026-08-22T15:16:19.367Z","references":["https://osv.dev/vulnerability/PYSEC-2026-3730","https://www.vulncheck.com/advisories/nltk-streambackedcorpusview-bypasses-pathsec-enforce-arbitrary-file-read","https://github.com/nltk/nltk/security/advisories/GHSA-x5ph-mj9p-rfr8"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"PYSEC-2026-3730","url":"https://osv.dev/vulnerability/PYSEC-2026-3730"},{"source":"nvd","source_id":"CVE-2026-63312","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63312"}],"summary":"NLTK before 3.10.0 contains an arbitrary local file read vulnerability in StreamBackedCorpusView that bypasses pathsec.ENFORCE by calling builtins.open() directly instead of pathsec.open(). Attackers"}