CVE-2026-33230
Fixed in a distro release EPSS <1%CVSS 6.1
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, `nltk.app.wordnet_app` contains a reflected cross-site scripting issue in the `lookup_...` route. A crafted `lookup_<payload>` URL can inject arbitrary HTML/JavaScript into the response page because attacker-controlled `word` data is reflected into HTML without escaping. This impacts users running the local WordNet Browser server and can lead to script execution in the browser origin of that application. Commit 1c3f799607eeb088cab2491dcf806ae83c29ad8f fixes the issue.
Products: nltk
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| PyPI | nltk | 3.9.4 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | apache-beam-python-3.11-sdk | 2.71.0-r8 |
| Chainguard | apache-beam-python-3.12-sdk | 2.71.0-r2 |
| Chainguard | apache-beam-python-3.13-sdk | 2.71.0-r2 |
| Chainguard | kubeflow-pipelines-visualization-server | 2.16.0-r3 |
| Chainguard | label-studio | 1.23.0-r1 |
| Chainguard | nemo | 2.7.2-r1 |
| Chainguard | open-webui | 0.8.12-r1 |
| Chainguard | open-webui | 0.8.12-r2 |
| 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 | kubeflow-pipelines-visualization-server | 2.16.0-r3 |
| Wolfi | open-webui | 0.8.12-r2 |
| Wolfi | open-webui | 0.8.12-r1 |
| 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 |
| openSUSE Tumbleweed | python-nltk | 3.9.4-1.1 |