Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N L N N U N N H 7.5 .0146 72.6 —
AFFECTED Product Versions Fixed nltk <= 3.9.3 – —
TIMELINE Mar 18 Reserved by GitHub_M Mar 20 Published (CNA: GitHub_M) Sep 9 EXPLOIT PUBLISHED — CVE-2026-33231 (nltk). Public exploit reference added.
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.
| Date | Event | Detail |
|---|---|---|
| March 18, 2026 | Reserved | Reserved by GitHub_M |
| March 20, 2026 | Published | Published (CNA: GitHub_M) |
| September 9, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-33231 (nltk). Public exploit reference added. |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| nltk | nltk | — | <= 3.9.3 | — |
Authoritative record: CVE-2026-33231 at cve.org
Vendors: nltk
Weaknesses: CWE-306
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-33231 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
