{"action":"Upgrade nltk to 3.10.0 or later.","affected":[{"fixed":"3.10.0","introduced":"0"}],"component":"nltk","cve_ids":["CVE-2026-12261"],"ecosystem":"PyPI","epss":0.00211,"exploited":false,"fixed_versions":["3.10.0"],"ghsa_id":"GHSA-ffj6-66c4-86gw","id":"tcs_01M5KFF5113QG28MW5R01080Q2","modified_at":"2026-10-02T23:40:50.637389089Z","published_at":"2026-08-07T09:31:52Z","references":["https://osv.dev/vulnerability/GHSA-ffj6-66c4-86gw","https://nvd.nist.gov/vuln/detail/CVE-2026-12261","https://github.com/nltk/nltk/pull/3625","https://github.com/nltk/nltk/commit/7a5740af89feeb739193db766e11e85dfe78339c","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-2026-3954.yaml","https://huntr.com/bounties/8b8c381e-08a8-4e4f-bb46-a320c96a364f"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GHSA-ffj6-66c4-86gw","url":"https://osv.dev/vulnerability/GHSA-ffj6-66c4-86gw"}],"summary":"NLTK downloader allows cross-package resource and model poisoning"}