CVE-2026-12199
CVE-2026-12199 · Unauthenticated Denial of Service in nltk.app.wordnet_app
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 7.5 · High · EPSS 0.3%
- Published
- Updated
Stack: system
Affected products and versions
nltk/nltk
- Versions
- ≥ unspecified, ≤ latest: Affected (custom)
No fix published
nltk Debian:12
- Versions
- 3.10.0-1
- 3.10.1-1
- 3.10.3-1
- 3.8-1
- 3.8.1-1
- 3.9.1-1
- 3.9.1-2
- 3.9.2-1
- 3.9.3-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nltk Debian:13
- Versions
- 3.10.0-1
- 3.10.1-1
- 3.10.3-1
- 3.9.1-2
- 3.9.2-1
- 3.9.3-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nltk Debian:14
- Versions
- 3.10.0-1
- 3.10.1-1
- 3.10.3-1
- 3.9.1-2
- 3.9.2-1
- 3.9.3-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nltk Ubuntu:Pro:14.04:LTS
- Versions
- 2.0~b9-0ubuntu4
- 2.0~b9-0ubuntu4.1~esm2
- 2.0~b9-0ubuntu4.1~esm4
- 2.0~b9-0ubuntu4.1~esm5
- 2.0~b9-0ubuntu4.1~esm6
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nltk Ubuntu:Pro:16.04:LTS
- Versions
- 3.0.4-1
- 3.0.5-1
- 3.1-1
- 3.1-1ubuntu0.1
- 3.1-1ubuntu0.1+esm1
- 3.1-1ubuntu0.1+esm2
- 3.1-1ubuntu0.1+esm3
- 3.1-1ubuntu0.1+esm4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nltk Ubuntu:Pro:18.04:LTS
- Versions
- 3.2.4-1
- 3.2.5-1
- 3.2.5-1ubuntu0.1
- 3.2.5-1ubuntu0.1+esm1
- 3.2.5-1ubuntu0.1+esm2
- 3.2.5-1ubuntu0.1+esm3
- 3.2.5-1ubuntu0.1+esm4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nltk Ubuntu:Pro:20.04:LTS
- Versions
- 3.4.5-1
- 3.4.5-2
- 3.4.5-2ubuntu0.1~esm1
- 3.4.5-2ubuntu0.1~esm2
- 3.4.5-2ubuntu0.1~esm3
- 3.4.5-2ubuntu0.1~esm4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nltk Ubuntu:Pro:22.04:LTS
- Versions
- 3.5-1
- 3.6.5-1
- 3.6.7-1
- 3.7-1
- 3.7-1ubuntu0.1~esm1
- 3.7-1ubuntu0.1~esm2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nltk Ubuntu:Pro:24.04:LTS
- Versions
- 3.8.1-1
- 3.8.1-1ubuntu0.1~esm1
- 3.8.1-1ubuntu0.1~esm2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nltk Ubuntu:25.10
- Versions
- 3.9.1-2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nltk Ubuntu:26.10
- Versions
- 3.9.2-1
- 3.9.3-1
- 3.10.0-1
- 3.10.1-1
- 3.10.3-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nltk Ubuntu:Pro:26.04:LTS
- Versions
- 3.9.1-2
- 3.9.1-2build1
- 3.9.2-1
- 3.9.2-1ubuntu0.1~esm1
- 3.9.2-1ubuntu0.1~esm2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published