CVE-2026-33236
Fixed in a distro release EPSS <1%CVSS 8.1
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.
Products: nltk, Red Hat OpenShift AI 2.25, Red Hat OpenShift AI 3.3, Red Hat Lightspeed Core, Red Hat OpenShift Lightspeed, Red Hat Ansible Automation Platform 2, Red Hat OpenShift AI (RHOAI)
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| PyPI | nltk | no fix |
| PyPI | nltk | 3.9.4 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | py3-nltk | 3.9.4-r0 |
| Chainguard | py3.11-nltk | 3.9.4-r0 |
| Chainguard | py3.12-nltk | 3.9.4-r0 |
| Chainguard | py3.13-nltk | 3.9.4-r0 |
| Debian 12 | nltk | no fix |
| Debian 13 | nltk | no fix |
| Debian 14 | nltk | 3.10.0-1 |
| Ubuntu 25.10 | nltk | no fix |
| Ubuntu 26.10 | nltk | no fix |
| Ubuntu Pro 14.04 LTS | nltk | 2.0~b9-0ubuntu4.1~esm6 |
| Ubuntu Pro 16.04 LTS | nltk | 3.1-1ubuntu0.1+esm4 |
| Ubuntu Pro 18.04 LTS | nltk | 3.2.5-1ubuntu0.1+esm4 |
| Ubuntu Pro 20.04 LTS | nltk | 3.4.5-2ubuntu0.1~esm4 |
| Ubuntu Pro 22.04 LTS | nltk | 3.7-1ubuntu0.1~esm2 |
| Ubuntu Pro 24.04 LTS | nltk | 3.8.1-1ubuntu0.1~esm2 |
| Ubuntu Pro 26.04 LTS | nltk | 3.9.2-1ubuntu0.1~esm2 |
| Wolfi | py3-nltk | 3.9.4-r0 |
| Wolfi | py3.11-nltk | 3.9.4-r0 |
| Wolfi | py3.12-nltk | 3.9.4-r0 |
| Wolfi | py3.13-nltk | 3.9.4-r0 |