CVE-2025-56005

CRITICAL

9.8

Descripcion

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.

Detalles CVE

Puntuacion CVSS v3.19.8

SeveridadCRITICAL

Vector CVSSCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vector de ataqueNETWORK

ComplejidadLOW

Privilegios requeridosNONE

Interaccion usuarioNONE

Publicado1/20/2026

Ultima modificacion2/6/2026

Fuentenvd

Avistamientos honeypot0

Productos afectados

dabeaz:ply

Debilidades (CWE)

CWE-502

Referencias

https://github.com/bohmiiidd/Undocumented-RCE-in-PLY(cve@mitre.org)

https://github.com/bohmiiidd/Undocumument_RCE_PLY-yacc-CVE-2025-56005(cve@mitre.org)

https://github.com/tom025/ply_exploit_rejection(cve@mitre.org)

https://github.com/tom025/ply_exploit_rejection/issues/1(cve@mitre.org)

http://www.openwall.com/lists/oss-security/2026/01/23/4(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2026/01/23/5(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2026/01/28/5(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2026/01/29/1(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2026/01/29/2(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2026/01/30/1(af854a3a-2127-422b-91ae-364da2661108)

Correlaciones IOC

Sin correlaciones registradas

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