CVE-2026-54293 NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research…
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. Prior to 3.10.0-rc1, nltk.data.load() in NLTK is vulnerable to path traversal via URL-encoded path separators and traversal segments when using the nltk: URL scheme. The unsafe-path regex check is performed before url2pathname() decodes the %xx sequences (a classic decode-after-check / TOCTOU-style flaw), allowing an attacker to bypass the protection documented in NLTK's SECURITY.md and read arbitrary files from the filesystem. While literal traversal strings such as ../../../etc/passwd are correctly blocked, encoded variants such as %2fetc%2fpasswd, %2e%2e%2f..., and ..%2f..%2f slip past the regex and are subsequently decoded into a real filesystem path. This vulnerability is fixed in 3.10.0-rc1.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| nltk 3.10 | earliest → < 3.10.0-rc1 | 3.10.0-rc1 |
| Exploit Intelligence | Versions not published | |
| OpenShift Lightspeed | Versions not published | |
| Red Hat Ansible Automation Platform 2 | Versions not published | |
| Red Hat OpenShift AI (RHOAI) | Versions not published | |
| Red Hat OpenShift AI 2.25 1787330903 | earliest → < 1787330903 | 1787330903 |
| Red Hat OpenShift AI 3.4 1787330585 | earliest → < 1787330585 | 1787330585 |
References
- github.com github.com
- github.com github.com
Timeline
- Published
- Last modified