{"action":"Upgrade nltk to 3.10.0 or later.","affected":[{"fixed":"3.10.0","introduced":"0"}],"component":"nltk","cve_ids":["CVE-2026-63311"],"ecosystem":"PyPI","epss":0.00334,"exploited":false,"fixed_versions":["3.10.0"],"ghsa_id":"GHSA-3gqm-fcw5-w839","id":"tcs_01M5KEVTPP48RND32KBG3PNW4T","modified_at":"2026-09-02T16:00:17.562331221Z","published_at":"2026-09-02T15:39:39Z","references":["https://osv.dev/vulnerability/GHSA-3gqm-fcw5-w839","https://github.com/nltk/nltk/security/advisories/GHSA-3gqm-fcw5-w839","https://nvd.nist.gov/vuln/detail/CVE-2026-63311","https://github.com/nltk/nltk/pull/3582","https://github.com/nltk/nltk/commit/4a820afa58810cd05049b6c6eae306694d6cfe65","https://github.com/nltk/nltk","https://github.com/nltk/nltk/releases/tag/v3.10.0","https://github.com/pypa/advisory-database/tree/main/vulns/nltk/PYSEC-2026-3723.yaml","https://www.vulncheck.com/advisories/nltk-before-ssrf-via-dns-resolution-failure"],"severity":{"label":"medium"},"sources":[{"source":"osv","source_id":"GHSA-3gqm-fcw5-w839","url":"https://osv.dev/vulnerability/GHSA-3gqm-fcw5-w839"}],"summary":"NLTK: SSRF Fail-Open in validate_network_url() via DNS Resolution Failure"}