PyPI/nltk CVE-2026-63311: medium, EPSS 0.33%

NLTK: SSRF Fail-Open in validate_network_url() via DNS Resolution Failure

Action: Upgrade nltk to 3.10.0 or later.

pip install nltk==3.10.0

Affected

Fixed versions

Sources

• osv: GHSA-3gqm-fcw5-w839
• https://github.com/nltk/nltk/security/advisories/GHSA-3gqm-fcw5-w839
• https://nvd.nist.gov/vuln/detail/CVE-2026-63311
• https://github.com/nltk/nltk/pull/3582
• 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-2026-3723.yaml
• https://www.vulncheck.com/advisories/nltk-before-ssrf-via-dns-resolution-failure

CVE-2026-63311 · published 2026-09-02T15:39:39Z · modified 2026-09-02T16:00:17.562331221Z · JSON