CVE Watch17 de set. de 2026

CVE-2025-56005

An undocumented and unsafe feature in the PLY (Python Lex-Yacc) library 3.11 allows Remote Code Execution (RCE) via the `picklefile` paramet

CVSS

9.8

Crítica

EPSS

18.8%

p97

KEV

—

Exploit Today

0-100

Publicado: 20 de jan. de 2026 · Última mod.: 17 de set. de 2026 · CWE-502

EPSS · 30d

18.8%EPSS · 30 dias19.1%

2026-10-142026-11-11

Descrição técnica

An undocumented and unsafe feature in the PLY (Python Lex-Yacc) library 3.11 allows Remote Code Execution (RCE) via the `picklefile` parameter in the `yacc()` function. This parameter accepts a `.pkl` file that is deserialized with `pickle.load()` without validation. Because `pickle` allows execution of embedded code via `__reduce__()`, an attacker can achieve code execution by passing a malicious pickle file. The parameter is not mentioned in official documentation or the GitHub repository, yet it is active in the PyPI version. This introduces a stealthy backdoor and persistence risk. NOTE: A third-party states that this vulnerability should be rejected because the proof of concept does not demonstrate arbitrary code execution and fails to complete successfully.

Referências oficiais

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