GHSA-qc6m-pwr3-g72pCriticalCVSS 9.8
An undocumented and unsafe feature in the PLY (Python Lex-Yacc) library 3.11 allows Remote Code...
🔗 CVE IDs covered (1)
📋 Description
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.
🔗 References (15)
- https://nvd.nist.gov/vuln/detail/CVE-2025-56005
- https://github.com/bohmiiidd/Undocumented-RCE-in-PLY
- http://www.openwall.com/lists/oss-security/2026/01/23/4
- http://www.openwall.com/lists/oss-security/2026/01/23/5
- https://github.com/tom025/ply_exploit_rejection
- https://github.com/bohmiiidd/Undocumument_RCE_PLY-yacc-CVE-2025-56005
- http://www.openwall.com/lists/oss-security/2026/01/28/5
- http://www.openwall.com/lists/oss-security/2026/01/29/1
- http://www.openwall.com/lists/oss-security/2026/01/29/2
- http://www.openwall.com/lists/oss-security/2026/01/30/1
- https://github.com/tom025/ply_exploit_rejection/issues/1
- https://access.redhat.com/security/cve/CVE-2025-56005
- 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/advisories/GHSA-qc6m-pwr3-g72p