{"id":"CVE-2026-33231","summary":"NLTK has unauthenticated remote shutdown in nltk.app.wordnet_app","details":"NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, `nltk.app.wordnet_app` allows unauthenticated remote shutdown of the local WordNet Browser HTTP server when it is started in its default mode. A simple `GET /SHUTDOWN%20THE%20SERVER` request causes the process to terminate immediately via `os._exit(0)`, resulting in a denial of service. Commit bbaae83db86a0f49e00f5b0db44a7254c268de9b patches the issue.","aliases":["GHSA-jm6w-m3j8-898g"],"modified":"2026-04-10T05:42:39.488239Z","published":"2026-03-20T22:45:40.784Z","related":["CGA-37mm-mc53-gxh5"],"database_specific":{"cna_assigner":"GitHub_M","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33231.json","cwe_ids":["CWE-306"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33231.json"},{"type":"ADVISORY","url":"https://github.com/nltk/nltk/security/advisories/GHSA-jm6w-m3j8-898g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33231"},{"type":"FIX","url":"https://github.com/nltk/nltk/commit/bbaae83db86a0f49e00f5b0db44a7254c268de9b"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/nltk/nltk","events":[{"introduced":"0"},{"fixed":"bbaae83db86a0f49e00f5b0db44a7254c268de9b"}]}],"versions":["2.0.1rc1","2.0.1rc2","2.0.1rc3","2.0.1rc4","3.0.0b1","3.0.2","3.0.3","3.0.4","3.0.5","3.0a4","3.1","3.2","3.2.1","3.2.2","3.2.3","3.2.4","3.2.5","3.3","3.4","3.4.1","3.4.3","3.4.4","3.5","3.5b1","3.6","3.6.1","3.6.2","3.6.5","3.6.6","3.6.7","3.7","3.8","3.8.1","3.8.2","3.9","3.9.1","3.9.2","3.9.3","v3.9.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33231.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}