HIGH7.5
PYSEC-2026-2236
Quick fix
PYSEC-2026-2236 — nltk: upgrade to the fixed version with the command below.
pip install --upgrade 'nltk>=3.9.4'Details
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 unauthenticated remote shutdown of the local WordNet Browser HTTP server when it is started in its default mode. A simple `GET /SHUTDOWN%20THE%20SERVER` request causes the process to terminate immediately via `os._exit(0)`, resulting in a denial of service. Commit bbaae83db86a0f49e00f5b0db44a7254c268de9b patches the issue.
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://access.redhat.com/security/cve/CVE-2026-33231[WEB]
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33231.json[WEB]
- https://access.redhat.com/errata/RHSA-2026:19712[ADVISORY]
- https://access.redhat.com/errata/RHSA-2026:24977[ADVISORY]
- https://access.redhat.com/errata/RHSA-2026:37275[ADVISORY]
- https://bugzilla.redhat.com/show_bug.cgi?id=2449836[REPORT]
- https://github.com/nltk/nltk/commit/bbaae83db86a0f49e00f5b0db44a7254c268de9b[FIX]
- https://github.com/nltk/nltk/security/advisories/GHSA-jm6w-m3j8-898g[EVIDENCE]