{"id":"CVE-2026-33231","aliases":["GHSA-jm6w-m3j8-898g","PYSEC-2026-2236"],"url":"https://o3.security/vulnerability/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.","published":"2026-03-20T22:45:40.784Z","modified":"2026-09-11T03:30:58.421890839Z","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":0,"affectedPackages":[{"ecosystem":"PyPI","name":"nltk","fixedVersion":"3.9.4"}],"fix":{"url":"https://github.com/nltk/nltk/commit/bbaae83db86a0f49e00f5b0db44a7254c268de9b","label":"nltk/nltk@bbaae83"},"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33231.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19712"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24977"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:37275"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:65126"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-33231"},{"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":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2449836"},{"type":"FIX","url":"https://github.com/nltk/nltk/commit/bbaae83db86a0f49e00f5b0db44a7254c268de9b"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-11T03:30:58.421890839Z"}}