PyPI/nltk CVE-2026-12372: low 3.7, EPSS 0.26%

NLTK network URL validation permits SSRF to RFC 6598 shared-address-space hosts

Action: Upgrade nltk to 3.10.0 or later.

pip install nltk==3.10.0

Affected

Fixed versions

Sources

• osv: GHSA-2jhm-w3mp-jcwr
• https://nvd.nist.gov/vuln/detail/CVE-2026-12372
• https://github.com/nltk/nltk/commit/4a820afa58810cd05049b6c6eae306694d6cfe65
• https://github.com/nltk/nltk
• https://github.com/nltk/nltk/releases/tag/v3.10.0
• https://github.com/pypa/advisory-database/tree/main/vulns/nltk/PYSEC-2026-3955.yaml
• https://huntr.com/bounties/2911b643-571c-42e4-b0c2-9a1fa6f491db

CVE-2026-12372 · published 2026-08-10T00:31:42Z · modified 2026-10-02T23:40:41.750758387Z · JSON