What is CVE-2026-33231?

CVE-2026-33231 is a high-severity vulnerability in Nltk, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-03-20.

How severe is CVE-2026-33231?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Nltk

CVE-2026-33231

NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, `nltk.app.wordnet_app` allows unauthenticat…

Vulnerability class: Broken Authentication

EPSS: 0.000 (5.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Nltk — versions <= 3.9.3

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

https://github.com/nltk/nltk/security/advisories/GHSA-jm6w-m3j8-898g (x_refsource_CONFIRM)
https://github.com/nltk/nltk/commit/bbaae83db86a0f49e00f5b0db44a7254c268de9b (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-33231?: CVE-2026-33231 is a high-severity vulnerability in Nltk, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-03-20.
How severe is CVE-2026-33231?: High severity. CVSS v3 base score is 7.5 out of 10.