In nltk version 3.9.4, the `nltk.downloader.Downloader._download_package()` function writes downloaded package bytes to disk and may extract them before enforcing SHA-256 or MD5 checksum validation. T
In nltk version 3.9.4, the nltk.downloader.Downloader._download_package() function writes downloaded package bytes to disk and may extract them before enforcing SHA-256 or MD5 checksum validation. This allows an attacker to tamper with the package response body for info.url through a compromised mirror, malicious proxy, or other source-substitution condition, leading to the installation of attacker-controlled package bytes. The vulnerability can result in malicious corpus or model content being trusted by downstream users or applications.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | nltk | <= 3.9.4 | sin corrección |
Referencias
- https://github.com/nltk/nltk/security/advisories/GHSA-5wp5-5229-5g6q
- https://nvd.nist.gov/vuln/detail/CVE-2026-12259
- https://github.com/nltk/nltk/pull/3449
- https://github.com/nltk/nltk/commit/0e26734a61094b628d93e26dc18dd7302567ac46
- https://github.com/nltk/nltk
- https://github.com/nltk/nltk/releases/tag/3.9.3
- https://github.com/pypa/advisory-database/tree/main/vulns/nltk/PYSEC-2026-3729.yaml
- https://huntr.com/bounties/659ccf6d-12d4-4d4a-84c0-078633c35a5d
- https://www.vulncheck.com/advisories/nltk-before-missing-post-download-integrity-verification
- https://nvd.nist.gov/vuln/detail/CVE-2026-63310
- https://github.com/advisories/GHSA-5wp5-5229-5g6q
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N- Debilidad (CWE)
CWE-494- Plataforma
- Python (PyPI)
- Paquete
nltk- Publicada
- 03.08.2026
- Actualizado
- 16.10.2026 13:17
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-3729 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-5wp5-5229-5g6q - CC BY 4.0
OSV / GitHub Advisory Database - GHSA-gf32-cmjh-8m9v - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-4318 - PyPA Advisory Database; 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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In nltk version 3.9.4, the `nltk.downloader.Downloader._download_package()` function writes downloaded package bytes to disk and may extract them before enforcing SHA-256 or MD5 checksum validation. T esta entrada
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