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A vulnerability in `nltk.downloader` in nltk/nltk versions <= 3.9.4 allows for cross-package resource and model poisoning. The downloader extracts package archives into shared namespaces such as `corp

  • Publicada: 07.08.2026
  • Actualizado: 15.10.2026 18:17

A vulnerability in nltk.downloader in nltk/nltk versions <= 3.9.4 allows for cross-package resource and model poisoning. The downloader extracts package archives into shared namespaces such as corpora/ and taggers/ instead of package-isolated roots, and validates package integrity only after the archive has been written and extracted. This design flaw enables one package to overwrite another package's trusted resources within the same namespace, making the changes immediately active through ordinary NLTK APIs. This issue persists across fresh interpreter restarts and can affect downstream workflows, including machine learning pipelines and reproducibility-sensitive environments.

Software afectado

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PlataformaPaqueteVersiones vulnerablesCorregida en
Python (PyPI) nltk < 3.10.0 3.10.0

Referencias

Puntuación CVSS 6.5/10
Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Debilidad (CWE)
CWE-284
Plataforma
Python (PyPI)
Paquete
nltk
Publicada
07.08.2026
Actualizado
15.10.2026 18:17

Fuentes y licencias

OSV / GitHub Advisory Database - PYSEC-2026-3954 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-ffj6-66c4-86gw - 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.

Todas (52) en el archivo
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

Gravedad:
  1. NLTK: Uncontrolled search path when invoking the Graphviz 'dot' binary
    Alta · 7.8 CVE-2026-78680 < 3.10.3 3.10.3
  2. NLTK: Model-artifact APIs bypass pathsec and touch files outside allowed roots
    Alta · 7.0 CVE-2026-81726 <= 3.10.3 sin corrección
  3. NLTK: ReDoS in nltk.tgrep via unvalidated user-supplied regular expressions
    Alta CVE-2026-80206 < 3.10.3 3.10.3
  4. NLTK: ReDoS in nltk.text.Text.findall() via unvalidated user-supplied regular expressions
    Alta · 7.5 CVE-2026-80205 < 3.10.0 3.10.0
  5. NLTK: JVM argument injection bypass via per-call options in the NLTK Stanford wrappers (incomplete fix of CVE-2026-12841)
    Crítica · 9.8 CVE-2026-79675 < 3.10.3 3.10.3
  6. NLTK: Corpus readers follow symlinks outside trusted roots despite pathsec enforcement
    Alta CVE-2026-79676 < 3.10.3 3.10.3
  7. NLTK: Corpus Reader Sandbox Bypass
    Alta CVE-2026-79674 < 3.10.3 3.10.3
  8. NLTK: Allowlisted pickle loaders still permit code execution in current source
    Crítica CVE-2026-79657 < 3.10.3 3.10.3
  9. NLTK: Unsafe Pickle Deserialization in TransitionParser Allows Remote Code Execution
    Crítica CVE-2026-78683 < 3.10.0 3.10.0
  10. NLTK: Entity-expansion DoS (billion laughs) via remaining raw ElementTree parses
    Alta CVE-2026-78681 < 3.10.3 3.10.3
  11. NLTK: pathsec SSRF protection can be bypassed when a proxy is configured
    Alta CVE-2026-78682 < 3.10.3 3.10.3
  12. NLTK AllowlistUnpickler dotted-name validation bypass allows remote code execution
    Alta · 8.8 CVE-2026-71513 >= 3.10.0, < 3.10.3 3.10.3
  13. NLTK: Symlink escape in CorpusReader allows arbitrary local file read outside the corpus root
    Alta · 6.2 CVE-2026-70626 < 3.9.4 3.9.4
  14. NLTK: StreamBackedCorpusView Bypasses pathsec.ENFORCE - Arbitrary Local File Read
    Alta CVE-2026-63312 < 3.10.0 3.10.0
  15. NLTK: Symlink-based sandbox bypass in FramenetCorpusReader (bypasses the fix for CVE-2026-54292)
    Alta · 7.5 CVE-2026-62384 >= 3.10.0, < 3.10.2 3.10.2
  16. NLTK: Stable FrameNet and NKJP readers parse outside-root XML
    Alta · 5.9 CVE-2026-62385 < 3.10.0 3.10.0
  17. NLTK: Default ENFORCE=False Disables All pathsec Security Controls
    Alta CVE-2026-62388 < 3.10.0 3.10.0
  18. NLTK TweetTokenizer vulnerable to denial of service through catastrophic regex backtracking
    Alta · 7.5 CVE-2026-72818 < 3.10.1 3.10.1
  19. A vulnerability in `nltk.downloader` in nltk/nltk versions <= 3.9.4 allows for cross-package resource and model poisoning. The downloader extracts package archives into shared namespaces such as `corp esta entrada
    Media · 6.5 CVE-2026-12261 < 3.10.0 3.10.0
  20. Natural Language Toolkit (NLTK): DNS-rebinding SSRF filter bypass in nltk.pathsec.urlopen (nltk.download / nltk.data.load) defeats ENFORCE mode
    Alta · 8.6 CVE-2026-12075 < 3.10.0 3.10.0
  21. Natural Language Toolkit (NLTK): ReDoS in NLTK ReviewsCorpusReader FEATURES regex
    Alta · 7.5 CVE-2026-12061 < 3.10.0 3.10.0
  22. Natural Language Toolkit (NLTK): Path Traversal in NKJPCorpusReader leads to Arbitrary File Read and bypasses the nltk.pathsec sandbox (ENFORCE=True)
    Alta · 7.5 CVE-2026-12072 < 3.10.0 3.10.0
  23. Natural Language Toolkit (NLTK) has path traversal in FramenetCorpusReader.frame() that allows arbitrary XML file read, bypassing the nltk.pathsec sandbox (ENFORCE=True)
    Alta · 7.5 CVE-2026-12074 < 3.10.0 3.10.0
  24. NLTK (Natural Language Toolkit) before version 3.9.3 contains an eval injection vulnerability in the nltk.collocations module that allows an attacker who controls command-line arguments to execute arb
    Alta CVE-2025-71408 < 3.9.3 3.9.3
  25. In nltk/nltk versions 3.9.3 and earlier, five Stanford interface classes (StanfordPOSTagger, StanfordNERTagger, StanfordParser, StanfordDependencyParser, and StanfordNeuralDependencyParser) are vulner
    Alta · 7.8 CVE-2026-12252 < 3.9.4 3.9.4
  26. NLTK version 3.9.4 is vulnerable to a path traversal attack due to an incomplete fix for GitHub Issue #3504. The `_UNSAFE_NO_PROTOCOL_RE` regex in `nltk/data.py` checks for literal `../` sequences but
    Alta · 7.5 CVE-2026-12243 <= 3.9.4 sin corrección
  27. Natural Language Toolkit (NLTK): URL-Encoded Path Traversal in nltk.data.load() Allows Arbitrary Local File Read
    Alta · 7.5 CVE-2026-54293 < 3.10.0 3.10.0
  28. NLTK has a Downloader Path Traversal Vulnerability (AFO) - Arbitrary File Overwrite
    Alta · 8.1 CVE-2026-33236 <= 3.9.2 sin corrección
  29. Unauthenticated remote shutdown in nltk.app.wordnet_app
    Alta · 7.5 CVE-2026-33231 < 3.9.4 3.9.4
  30. A vulnerability in the `filestring()` function of the `nltk.util` module in nltk version 3.9.2 allows arbitrary file read due to improper validation of input paths. The function directly opens files s
    Alta · 7.5 CVE-2026-0846 <= 3.9.2 sin corrección
  31. NLTK versions <=3.9.2 are vulnerable to arbitrary code execution due to improper input validation in the StanfordSegmenter module. The module dynamically loads external Java .jar files without verific
    Crítica · 10.0 CVE-2026-0848 < 3.9.3 3.9.3
  32. A vulnerability in NLTK versions up to and including 3.9.2 allows arbitrary file read via path traversal in multiple CorpusReader classes, including WordListCorpusReader, TaggedCorpusReader, and Brack
    Alta · 7.5 CVE-2026-0847 < 3.9.3 3.9.3
  33. NLTK has a Zip Slip Vulnerability
    Crítica · 10.0 CVE-2025-14009 < 3.9.3 3.9.3
  34. ntlk unsafe deserialization vulnerability
    Alta · 7.5 CVE-2024-39705 < 3.9 3.9
  35. NLTK Vulnerable to REDoS
    Alta · 7.5 CVE-2021-3842 < 3.6.6 3.6.6
  36. Inefficient Regular Expression Complexity in nltk (word_tokenize, sent_tokenize)
    Alta · 7.5 CVE-2021-43854 < 3.6.6 3.6.6
  37. NLTK Vulnerable to REDoS
    Alta · 7.5 CVE-2021-3828 < 3.6.4 3.6.4
  38. NLTK Vulnerable To Path Traversal
    Alta · 7.5 CVE-2019-14751 < 3.4.5 3.4.5

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