{"action":"Upgrade nltk to 3.10.3 or later.","affected":[{"fixed":"3.10.3","introduced":"0"}],"component":"nltk","cve_ids":["CVE-2026-81724"],"ecosystem":"PyPI","epss":0.00456,"exploited":false,"fixed_versions":["3.10.3"],"ghsa_id":"GHSA-cw6x-m8jw-qmrh","id":"tcs_01M5KFDWJRNHTXMR9T5703FRVK","modified_at":"2026-09-10T03:51:15.361788366Z","published_at":"2026-09-02T14:33:22Z","references":["https://osv.dev/vulnerability/GHSA-cw6x-m8jw-qmrh","https://github.com/nltk/nltk/security/advisories/GHSA-cw6x-m8jw-qmrh","https://nvd.nist.gov/vuln/detail/CVE-2026-81724","https://github.com/nltk/nltk/commit/43c7b78cc8ea37e5cd3a129e27e32c415ea21cf1","https://github.com/nltk/nltk","https://github.com/nltk/nltk/releases/tag/v3.10.3","https://github.com/pypa/advisory-database/tree/main/vulns/nltk/PYSEC-2026-3739.yaml","https://www.vulncheck.com/advisories/nltk-before-3.10.3-denial-of-service-via-uncontrolled-recursion"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GHSA-cw6x-m8jw-qmrh","url":"https://osv.dev/vulnerability/GHSA-cw6x-m8jw-qmrh"}],"summary":"NLTK: Uncontrolled recursion in nltk.featstruct.FeatStructReader causes unhandled RecursionError (DoS) via deeply nested feature-structure input"}