| Name | CVE-2026-109956 |
| Description | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1150904 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| nltk (PTS) | bookworm | 3.8-1 | vulnerable |
| trixie | 3.9.1-2 | vulnerable |
| forky, sid | 3.10.3-1 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| nltk | source | (unstable) | (unfixed) | | | 1150904 |
Notes
[trixie] - nltk <no-dsa> (Minor issue)
[bookworm] - nltk <postponed> (Minor issue; can be fixed in next update)
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