PyPI/nltk CVE-2026-12252: high 7.8, EPSS 0.19%

NLTK Stanford wrapper classes execute untrusted JAR files without verification

Action: Upgrade nltk to 3.9.4 or later.

pip install nltk==3.9.4

Affected

Fixed versions

Sources

• osv: GHSA-9r6g-266r-89x4
• https://nvd.nist.gov/vuln/detail/CVE-2026-12252
• https://github.com/nltk/nltk/pull/3743
• https://github.com/nltk/nltk/commit/006f4b83d430147b067b81e2cddd226d6fa405c8
• https://github.com/nltk/nltk/commit/24777f0cb8c33ed2839d16e0f8169a3c312a6806
• https://github.com/nltk/nltk
• https://github.com/nltk/nltk/releases/tag/v3.10.3
• https://github.com/pypa/advisory-database/tree/main/vulns/nltk/PYSEC-2026-2085.yaml
• https://huntr.com/bounties/f5c93982-0cc9-4e2e-bb85-1b6ab29a2efb

CVE-2026-12252 · published 2026-07-04T03:31:03Z · modified 2026-10-02T18:55:37.071322102Z · JSON