{"action":"No fix published. Pin and monitor.","affected":[{"introduced":"0","last_affected":"3.9.4"}],"component":"nltk","cve_ids":["CVE-2026-12259","CVE-2026-63310"],"ecosystem":"PyPI","exploited":false,"fixed_versions":[],"ghsa_id":"GHSA-5wp5-5229-5g6q","id":"tcs_01M5JHHNNE5B4ZADD9HV62SK77","modified_at":"2026-10-16T10:56:05.808390648Z","published_at":"2026-08-03T08:17:17.880Z","references":["https://osv.dev/vulnerability/PYSEC-2026-4318","https://huntr.com/bounties/659ccf6d-12d4-4d4a-84c0-078633c35a5d"],"severity":{"label":"medium","score":6.5},"sources":[{"source":"osv","source_id":"PYSEC-2026-4318","url":"https://osv.dev/vulnerability/PYSEC-2026-4318"}],"summary":"In nltk version 3.9.4, the `nltk.downloader.Downloader._download_package()` function writes downloaded package bytes to disk and may extract them before enforcing SHA-256 or MD5 checksum validation. T"}