Bug#1131457: nltk: CVE-2026-33230

[Salvatore Bonaccorso]

Source: nltk
Version: 3.9.3-1
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for nltk.

CVE-2026-33230[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-33230
    https://www.cve.org/CVERecord?id=CVE-2026-33230
[1] https://github.com/nltk/nltk/security/advisories/GHSA-gfwx-w7gr-fvh7
[2] https://github.com/nltk/nltk/commit/1c3f799607eeb088cab2491dcf806ae83c29ad8f

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore