{"action":"Upgrade nltk to 3.9.3 or later.","affected":[{"fixed":"3.9.3","introduced":"0"}],"component":"nltk","cve_ids":["CVE-2026-12259","CVE-2026-63310"],"ecosystem":"PyPI","epss":0.00101,"exploited":false,"fixed_versions":["3.9.3"],"ghsa_id":"GHSA-5wp5-5229-5g6q","id":"tcs_01M5JHHK4DJZ0DC4P7ECQ67E53","modified_at":"2026-10-16T10:56:05.808390648Z","published_at":"2026-09-08T15:27:55Z","references":["https://osv.dev/vulnerability/GHSA-5wp5-5229-5g6q","https://github.com/nltk/nltk/security/advisories/GHSA-5wp5-5229-5g6q","https://nvd.nist.gov/vuln/detail/CVE-2026-12259","https://github.com/nltk/nltk/pull/3449","https://github.com/nltk/nltk/commit/0e26734a61094b628d93e26dc18dd7302567ac46","https://github.com/nltk/nltk","https://github.com/nltk/nltk/releases/tag/3.9.3","https://github.com/pypa/advisory-database/tree/main/vulns/nltk/PYSEC-2026-3729.yaml","https://huntr.com/bounties/659ccf6d-12d4-4d4a-84c0-078633c35a5d","https://www.vulncheck.com/advisories/nltk-before-missing-post-download-integrity-verification"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GHSA-5wp5-5229-5g6q","url":"https://osv.dev/vulnerability/GHSA-5wp5-5229-5g6q"}],"summary":"NLTK: Missing Post-Download Integrity Verification Allows Malicious Package Injection"}