A Server-Side Request Forgery (SSRF) vulnerability exists in nltk/nltk versions 3.9.4 and the current develop branch. The `nltk.pathsec.validate_network_url()` function, intended to prevent SSRF by re
A Server-Side Request Forgery (SSRF) vulnerability exists in nltk/nltk versions 3.9.4 and the current develop branch. The nltk.pathsec.validate_network_url() function, intended to prevent SSRF by rejecting internal network addresses, fails to reject IPs in the RFC 6598 shared address space (100.64.0.0/10). This occurs because Python's ipaddress module does not classify such addresses as is_private or is_global, and the current guard only checks is_private and a few explicit categories. An attacker who can influence a URL passed to NLTK's network-loading helpers can exploit this vulnerability to make a strict-mode application send requests to shared-address-space hosts, potentially exposing non-public infrastructure reachable from the application host. The impact is limited to SSRF-style confidentiality exposure, with no code execution claimed.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | nltk | <= 3.9.4 | sin corrección |
Referencias
- https://nvd.nist.gov/vuln/detail/CVE-2026-12372
- https://github.com/nltk/nltk/commit/4a820afa58810cd05049b6c6eae306694d6cfe65
- https://github.com/nltk/nltk
- https://github.com/nltk/nltk/releases/tag/v3.10.0
- https://github.com/pypa/advisory-database/tree/main/vulns/nltk/PYSEC-2026-3955.yaml
- https://huntr.com/bounties/2911b643-571c-42e4-b0c2-9a1fa6f491db
- https://github.com/advisories/GHSA-2jhm-w3mp-jcwr
- Vector CVSS
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N- Debilidad (CWE)
CWE-918- Plataforma
- Python (PyPI)
- Paquete
nltk- Publicada
- 10.08.2026
- Actualizado
- 15.10.2026 18:17
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-3955 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-2jhm-w3mp-jcwr - CC BY 4.0
Historial de vulnerabilidades: nltk
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 52
- Primera → última
- 08.2019 09.2026
- Sin corrección
- 6
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 5
- Alta 32
- Media 13
- Baja 2
Divulgaciones por año
- 2019: 1
- 2020: 0
- 2021: 2
- 2022: 1
- 2023: 0
- 2024: 1
- 2025: 0
- 2026: 47
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A Server-Side Request Forgery (SSRF) vulnerability exists in nltk/nltk versions 3.9.4 and the current develop branch. The `nltk.pathsec.validate_network_url()` function, intended to prevent SSRF by re esta entrada
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