Bug#1150904: nltk: CVE-2026-109956

[Moritz Mühlenhoff]

Source: nltk
X-Debbugs-CC: team at security.debian.org
Severity: important
Tags: security

Hi,

The following vulnerability was published for nltk.

CVE-2026-109956[0]:
| NLTK through 3.10.3 contains a path traversal vulnerability in
| WekaClassifier that allows attackers to bypass nltk.pathsec
| containment by supplying unvalidated model paths. Attackers
| controlling the model_filename or model argument can make the weka
| JVM write files via -d or probe files via -l outside allowed data
| roots.

https://github.com/nltk/nltk/security/advisories/GHSA-j456-xh4h-cpf2
https://github.com/nltk/nltk/pull/3863
https://github.com/nltk/nltk/commit/6a17606293fe9d3ea1006f99dd3fed2e2b25d519


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-2026-109956
    https://www.cve.org/CVERecord?id=CVE-2026-109956

Please adjust the affected versions in the BTS as needed.