{"id":"CVE-2026-126297","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-126297","summary":"NLTK before 3.10.4 contains a quadratic-time denial of service vulnerability in ConllCorpusReader._get_srl_instances that allows remote attackers to exhaust CPU through nested span…","details":"NLTK before 3.10.4 contains a quadratic-time denial of service vulnerability in ConllCorpusReader._get_srl_instances that allows remote attackers to exhaust CPU through nested span rescans. Attackers can supply a crafted CoNLL SRL corpus with many predicates and span columns, placing the head span last, to pin a core for minutes.","published":"2026-11-13T09:36:27.884Z","modified":"2026-11-13T09:36:27.884Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/nltk/nltk/security/advisories/GHSA-v8f3-6phw-6mh9"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/nltk-before-3.10.4-cpu-denial-of-service-via-conllcorpusreader-srl-instances"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-11-13T09:36:27.884Z"}}