{"dataType":"CVE_RECORD","cveMetadata":{"state":"PUBLISHED","cveId":"CVE-2025-56005","assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","assignerShortName":"mitre","dateUpdated":"2026-02-06T19:55:53.916Z","dateReserved":"2025-08-16T00:00:00.000Z","datePublished":"2026-01-20T00:00:00.000Z"},"containers":{"cna":{"providerMetadata":{"orgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","shortName":"mitre","dateUpdated":"2026-02-06T19:55:53.916Z"},"descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}],"references":[{"url":"https://github.com/bohmiiidd/Undocumented-RCE-in-PLY"},{"url":"https://github.com/tom025/ply_exploit_rejection"},{"url":"https://github.com/bohmiiidd/Undocumument_RCE_PLY-yacc-CVE-2025-56005"},{"url":"https://github.com/tom025/ply_exploit_rejection/issues/1"}],"problemTypes":[{"descriptions":[{"type":"text","lang":"en","description":"n/a"}]}],"tags":["disputed"]},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-502","lang":"en","description":"CWE-502 Deserialization of Untrusted Data"}]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":9.8,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-01-20T18:47:19.926886Z","id":"CVE-2025-56005","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-01-20T18:49:29.501Z"}},{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/01/23/4"},{"url":"http://www.openwall.com/lists/oss-security/2026/01/23/5"},{"url":"http://www.openwall.com/lists/oss-security/2026/01/28/5"},{"url":"http://www.openwall.com/lists/oss-security/2026/01/29/1"},{"url":"http://www.openwall.com/lists/oss-security/2026/01/29/2"},{"url":"http://www.openwall.com/lists/oss-security/2026/01/30/1"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2026-01-30T23:06:25.298Z"}}]},"dataVersion":"5.2"}