Path Traversal in Nltk Nltk/nltk
CVE-2026-12243
NLTK version 3.9.4 is vulnerable to a path traversal attack due to an incomplete fix for GitHub Issue #3504. The `_UNSAFE_NO_PROTOCOL_RE` regex in `nltk/data.py` checks for literal `../` sequences but fails to account for percent-encoded t…
Vulnerability class: Path Traversal (Directory Traversal)
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Nltk Nltk/nltk — versions unspecified
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-12243?
- CVE-2026-12243 is a high-severity vulnerability in Nltk Nltk/nltk, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-06-30.
- How severe is CVE-2026-12243?
- High severity. CVSS v3 base score is 7.5 out of 10.