CVE-2026-33236
HIGHCVSS v3.1: 8.1 · EPSS: 0.0040 (31.6 percentile)
Source data as of:
At a glance
- Severity
- HIGH
- CVSS
- 8.1 v3.1 · NVD
- EPSS
- 0.0040 (31.6 percentile) · FIRST.org
- CISA KEV
- No
- Type
- Path Traversal · NVD CWE
- Attack conditions (CVSS vector)
- NetworkNo privileges · Source: NVD Vector
- Affected vendors
- nltk
- Published
- 2026-03-20 · Modified: 2026-06-30
- References
- Jump to references (7)
CVSS / EPSS / KEV
Source — CVSS: NVD · EPSS: FIRST.org · KEV: CISA. Data & Sources
Description
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.
References
Reference URLs as listed by NVD, grouped by a mechanical match on the link's host/pattern. Labels describe the link type only.
- Patch https://github.com/nltk/nltk/commit/89fe2ec2c6bae6e2e7a46dad65cc34231976ed8a
- Vendor advisory https://github.com/nltk/nltk/security/advisories/GHSA-469j-vmhf-r6v7
- Distro https://access.redhat.com/errata/RHSA-2026:10184
- Distro https://access.redhat.com/errata/RHSA-2026:19712
- Distro https://access.redhat.com/security/cve/CVE-2026-33236
- Distro https://bugzilla.redhat.com/show_bug.cgi?id=2449824
- Distro https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33236.json