PyPI/nltk CVE-2026-12243: high 7.5
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
Action: No fix published. Pin and monitor.
Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | - | 3.9.4 |
Fixed versions
No fixed version in the source.
Sources
- osv: PYSEC-2026-597
- https://huntr.com/bounties/39aa9354-54ca-4e77-96da-580eb1fe6ed1
- https://github.com/advisories/GHSA-m42h-3232-vpv3
CVE-2026-12243 · published · modified · JSON