9.8

CVE-2025-56005

Exploit
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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Dabeaz ≫ Ply Version3.11
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 17.15% 0.968
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
CISA-ADP 9.8 3.9 5.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0b0ca135-0b70-47e7-9f44-1890c2a1c46c 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-502 Deserialization of Untrusted Data

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

http://www.openwall.com/lists/oss-security/2026/01/23/4
Exploit
Mailing List
http://www.openwall.com/lists/oss-security/2026/01/23/5
Mailing List
https://github.com/tom025/ply_exploit_rejection
Third Party Advisory
Exploit
Mitigation
http://www.openwall.com/lists/oss-security/2026/01/28/5
Exploit
Mailing List
http://www.openwall.com/lists/oss-security/2026/01/29/1
Exploit
Mailing List
http://www.openwall.com/lists/oss-security/2026/01/29/2
Mailing List
http://www.openwall.com/lists/oss-security/2026/01/30/1
https://github.com/tom025/ply_exploit_rejection/issues/1
https://bugzilla.redhat.com/show_bug.cgi?id=2431308
https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-56005.json
https://github.com/bohmiiidd/Undocumented-RCE-in-PLY
Third Party Advisory
Exploit
https://github.com/bohmiiidd/Undocumument_RCE_PLY-yacc-CVE-2025-56005
Third Party Advisory
Exploit
https://access.redhat.com/security/cve/CVE-2025-56005