{"action":"Upgrade nltk to 3.10.3 or later.","affected":[{"fixed":"3.10.3","introduced":"0"}],"component":"nltk","cve_ids":["CVE-2026-80206"],"ecosystem":"PyPI","epss":0.0044,"exploited":false,"fixed_versions":["3.10.3"],"ghsa_id":"GHSA-w3v8-gmh9-3wv7","id":"tcs_01M5KH74DF2706A220ZTE12S2D","modified_at":"2026-09-02T09:00:05.019508486Z","published_at":"2026-08-26T11:16:40.103Z","references":["https://osv.dev/vulnerability/PYSEC-2026-3751","https://www.vulncheck.com/advisories/nltk-3.10.2-regular-expression-denial-of-service-via-tgrep","https://github.com/nltk/nltk/security/advisories/GHSA-w3v8-gmh9-3wv7"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"PYSEC-2026-3751","url":"https://osv.dev/vulnerability/PYSEC-2026-3751"}],"summary":"NLTK before 3.10.3 contains a regular expression denial of service (ReDoS) vulnerability in the tgrep module. The _tgrep_node_action function compiles user-supplied regular expressions embedded in /re"}