---
cve: "CVE-2026-33236"
severity: "HIGH"
cvss: 8.1
epss: "58%"
vendor: "nltk"
kev: false
exploited: false
published: "2026-03-20 23:16:47"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-04T16:19:35+02:00"
---

# CVE-2026-33236

> 8.1 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, the NLTK downloader does not validate the `subdir` and `id` attributes when processing remote XML index files. Attackers can control a remote XML index server to provide malicious values containing path traversal sequences (such as `../`), which can lead to arbitrary directory creation, arbitrary file creation, and arbitrary file overwrite. Commit 89fe2ec2c6bae6e2e7a46dad65cc34231976ed8a patches the issue.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 89fe2ec2c6bae6e2e7a46dad65cc34231976ed8a (Commit)

## Referenzen

- <https://github.com/nltk/nltk/security/advisories/GHSA-469j-vmhf-r6v7>
- <https://github.com/nltk/nltk/commit/89fe2ec2c6bae6e2e7a46dad65cc34231976ed8a>
- <https://access.redhat.com/errata/RHSA-2026:10184>
- <https://access.redhat.com/errata/RHSA-2026:19712>
- <https://access.redhat.com/errata/RHSA-2026:37275>
- <https://access.redhat.com/errata/RHSA-2026:42644>
- <https://access.redhat.com/security/cve/CVE-2026-33236>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2449824>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33236.json>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-33236) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_