CVE-2026-33231
HIGHCVSS v3.1: 7.5 · EPSS: 0.0054 (41.4 percentile)
Source data as of:
At a glance
- Severity
- HIGH
- CVSS
- 7.5 v3.1 · NVD
- EPSS
- 0.0054 (41.4 percentile) · FIRST.org
- CISA KEV
- No
- Type
- Missing Authentication · NVD CWE
- Attack conditions (CVSS vector)
- NetworkNo privilegesNo user interaction · Source: NVD Vector
- Affected vendors
- nltk
- Published
- 2026-03-20 · Modified: 2026-06-30
- References
- Jump to references (7)
CVSS / EPSS / KEV
Source — CVSS: NVD · EPSS: FIRST.org · KEV: CISA. Data & Sources
Description
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.
References
Reference URLs as listed by NVD, grouped by a mechanical match on the link's host/pattern. Labels describe the link type only.
- Patch https://github.com/nltk/nltk/commit/bbaae83db86a0f49e00f5b0db44a7254c268de9b
- Vendor advisory https://github.com/nltk/nltk/security/advisories/GHSA-jm6w-m3j8-898g
- Distro https://access.redhat.com/errata/RHSA-2026:19712
- Distro https://access.redhat.com/errata/RHSA-2026:24977
- Distro https://access.redhat.com/security/cve/CVE-2026-33231
- Distro https://bugzilla.redhat.com/show_bug.cgi?id=2449836
- Distro https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33231.json