Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| nltk / nltk | affected <= 3.9.3 |
CWE
CWE-22
References
- https://github.com/nltk/nltk/security/advisories/GHSA-469j-vmhf-r6v7
- https://github.com/nltk/nltk/commit/89fe2ec2c6bae6e2e7a46dad65cc34231976ed8a
ADP enrichment
No English description supplied.
No references supplied.
A flaw was found in NLTK (Natural Language Toolkit), a suite of open-source Python modules for Natural Language Processing. The NLTK downloader does not validate `subdir` and `id` attributes when processing remote XML index files. A remote attacker can exploit this path traversal vulnerability by controlling a malicious XML index server, providing specially crafted values. This can lead to arbitrary directory creation, arbitrary file creation, and arbitrary file overwrite on the system where NLTK is used.
- https://access.redhat.com/security/cve/CVE-2026-33236
- https://bugzilla.redhat.com/show_bug.cgi?id=2449824
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33236.json
- https://access.redhat.com/errata/RHSA-2026:10184
- https://access.redhat.com/errata/RHSA-2026:42644
- https://access.redhat.com/errata/RHSA-2026:19712
- https://access.redhat.com/errata/RHSA-2026:37275