CVE catalog
CVE-2026-12199
A vulnerability in `nltk.app.wordnet_app` up to version 3.9.3 allows unauthenticated remote shutdown of the local WordNet Browser HTTP server when started in its default mode. The server listens on al
- Severity
- High · CVSS 7.5
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.33% · Oct 25, 2026
A vulnerability in `nltk.app.wordnet_app` up to version 3.9.3 allows unauthenticated remote shutdown of the local WordNet Browser HTTP server when started in its default mode. The server listens on all interfaces and processes a specific unauthenticated GET request (`/SHUTDOWN%20THE%20SERVER`) to terminate the process immediately via `os._exit(0)`. This results in a denial of service, impacting service availability. The issue arises due to insufficient authentication and protection mechanisms for critical server functions.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | nltk | sid | 3.10.3-1 | vulnerable |
| Debian | nltk | forky | 3.10.3-1 | vulnerable |
| Debian | nltk | trixie | 3.9.1-2 | vulnerable |
| Debian | nltk | bookworm | 3.8-1 | vulnerable |
| Cpe | nltk | Not reported | Not reported | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | nltk | source | sid | (unfixed) | not yet assigned | Not reported | [1140486] |
| Debian | nltk | source | forky | (unfixed) | not yet assigned | Not reported | [1140486] |
| Debian | nltk | source | trixie | (unfixed) | not yet assigned | Not reported | [1140486] |
| Debian | nltk | source | bookworm | (unfixed) | not yet assigned | Not reported | [1140486] |
Notes
[trixie] nltk: Minor issue [bookworm] nltk: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-nltk]Affected
Source package: [nltk]
Details (2)
3.8-1· all · bookwormAffected
nvd · nltk · debian · bookworm; nvd · nltk · debian · 12
3.8-1· all · bookwormAffected
nvd · nltk · debian · bookworm; nvd · nltk · debian · 12
[Debian 13 (Trixie)]
- [python3-nltk]Affected
Source package: [nltk]
Details (2)
3.9.1-2· all · trixieAffected
nvd · nltk · debian · 13
3.9.1-2· all · trixieAffected
nvd · nltk · debian · 13
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-12199]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-12199]
- [https://security-tracker.debian.org/tracker/CVE-2026-12199]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12199.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]