Advisory details:
pypa / nltk/PYSEC-2026-2236
| Advisory ID | pypa/nltk/PYSEC-2026-2236 |
| Aliases |
CVE-2026-33231
GHSA-jm6w-m3j8-898g PYSEC-2026-2236 |
| Summary | 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. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 6.8 |
| Risk | 3.4 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| There are no known CWE. |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | 7.5 | https://github.com/pypa/advisory-database/blob/main/vulns/nltk/PYSEC-2026-2236.yaml |
| Reference id | Reference type | URL |
|---|---|---|
| https://access.redhat.com/errata/RHSA-2026:37275 | ||
| https://bugzilla.redhat.com/show_bug.cgi?id=2449836 | ||
| https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33231.json | ||
| bbaae83db86a0f49e00f5b0db44a7254c268de9b | Other | https://github.com/nltk/nltk/commit/bbaae83db86a0f49e00f5b0db44a7254c268de9b |
| CVE-2026-33231 | https://access.redhat.com/security/cve/CVE-2026-33231 | |
| GHSA-jm6w-m3j8-898g | Other | https://github.com/nltk/nltk/security/advisories/GHSA-jm6w-m3j8-898g |
| RHSA-2026:19712 | https://access.redhat.com/errata/RHSA-2026:19712 | |
| RHSA-2026:24977 | https://access.redhat.com/errata/RHSA-2026:24977 |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-25T13:43:39Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/33xxx/CVE-2026-33231.json
Source Advisory: vulnrichment/CVE-2026-33231
[{'Exploitation': 'poc'},
{'Automatable': 'yes'},
{'Technical Impact': 'partial'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]