Natural Language Toolkit (NLTK): DNS-rebinding SSRF filter bypass in nltk.pathsec.urlopen (nltk.download / nltk.data....

Date Jul 31, 2026

Type Vendor advisory

Signal High-risk advisory

Vendor / Product PyPI · nltk

CVE CVE-2026-12075

High-risk advisory CVE-2026-12075

Summary

Natural Language Toolkit (NLTK): DNS-rebinding SSRF filter bypass in nltk.pathsec.urlopen (nltk.download / nltk.data.load) defeats ENFORCE mode

Why it matters

GitHub has published a reviewed security advisory for nltk. Prioritize it with other application dependency updates.

Operator check

Check whether nltk is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available.

Sources

GitHub Advisory GHSA-qvv7-cg9c-w4x3 NVD — CVE-2026-12075 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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