by Kastro
Paper/Archive/CVE-2025-56005

CVE-2025-56005

Red Hat Fence Agents Remediation Operator — An undocumented and unsafe feature in the PLY (Python Lex-Yacc) library 3.11 allows Remote Code Execution (RCE) via the `picklefile` para…

EPSS 19%public exploitCVSS 9.8
critical.is priorityof 100
59
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 97.3.973 × 2019.5Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
n/an/a–CNA
Fence Agents Remediation Operatorsee advisory–redhat-SADP
Migration Toolkit for Containerssee advisory–redhat-SADP
Migration Toolkit for Containerssee advisory–redhat-SADP
Migration Toolkit for Virtualizationsee advisory–redhat-SADP
Migration Toolkit for Virtualizationsee advisory–redhat-SADP
Migration Toolkit for Virtualizationsee advisory–redhat-SADP
Migration Toolkit for Virtualizationsee advisory–redhat-SADP
OpenShift Developer Tools and Servicessee advisory–redhat-SADP
OpenShift Developer Tools and Servicessee advisory–redhat-SADP
OpenShift Pipelinessee advisory–redhat-SADP
OpenShift Pipelinessee advisory–redhat-SADP

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
redhat-SADP (CNA)7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

refgithub.com/bohmiiidd/Undocumented-RCE-in-PLYrefgithub.com/tom025/ply_exploit_rejectionrefgithub.com/bohmiiidd/Undocumument_RCE_PLY-yacc-CVE-2025-56005refgithub.com/tom025/ply_exploit_rejection/issues/1refopenwall.com/lists/oss-security/2026/01/23/4refopenwall.com/lists/oss-security/2026/01/23/5refopenwall.com/lists/oss-security/2026/01/28/5refopenwall.com/lists/oss-security/2026/01/29/1refopenwall.com/lists/oss-security/2026/01/29/2refopenwall.com/lists/oss-security/2026/01/30/1refaccess.redhat.com/security/cve/CVE-2025-56005refbugzilla.redhat.com/show_bug.cgi?id=2431308refsecurity.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-56005.json