---
cve: "CVE-2026-33231"
severity: "HIGH"
cvss: 7.5
epss: "88%"
vendor: "nltk"
kev: false
exploited: false
published: "2026-03-20 23:16:46"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-04T16:19:34+02:00"
---

# CVE-2026-33231

> 7.5 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- bbaae83db86a0f49e00f5b0db44a7254c268de9b (Commit)

## Referenzen

- <https://github.com/nltk/nltk/security/advisories/GHSA-jm6w-m3j8-898g>
- <https://github.com/nltk/nltk/commit/bbaae83db86a0f49e00f5b0db44a7254c268de9b>
- <https://access.redhat.com/errata/RHSA-2026:19712>
- <https://access.redhat.com/errata/RHSA-2026:24977>
- <https://access.redhat.com/errata/RHSA-2026:37275>
- <https://access.redhat.com/security/cve/CVE-2026-33231>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2449836>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33231.json>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-33231) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_