{"apiVersion":"1.0","identifier":"CVE-2026-81724","description":"NLTK before 3.10.3 contains an uncontrolled recursion vulnerability in nltk.featstruct.FeatStructReader that allows unauthenticated attackers to cause a denial of service by supplying deeply nested feature-structure input. Attackers can craft trivial payloads with nested brackets that exceed Python-s recursion limit and raise an unhandled RecursionError, crashing applications that parse user-supplied feature structures or feature grammars.","publishedAt":"2026-08-27T17:21:03","lastModifiedAt":"2026-08-27T20:18:54","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-81724","cvssScore":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","epssProbability":0.00258,"riskScore":0.54,"affectedProduct":"NLTK","affectedVersions":"<3.10.3","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-81724","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-81724","en":"https://www.redsauce.net/en/cves/CVE-2026-81724","fr":"https://www.redsauce.net/fr/cves/CVE-2026-81724","pt":"https://www.redsauce.net/pt/cves/CVE-2026-81724","de":"https://www.redsauce.net/de/cves/CVE-2026-81724","sk":"https://www.redsauce.net/sk/cves/CVE-2026-81724","el":"https://www.redsauce.net/el/cves/CVE-2026-81724"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-81724"}}