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Python CVE-2025-56005

CRITICAL
Deserialization of Untrusted Data (CWE-502)
2026-01-20 cve@mitre.org
9.8
CVSS 3.1 · Vendor: mitre
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Severity by source

Vendor (mitre) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SUSE
CRITICAL
qualitative
Red Hat
7.8 HIGH
qualitative

Primary rating from Vendor (mitre).

CVSS VectorVendor: mitre

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Patch released
Apr 06, 2026 - 20:30 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
PoC Detected
Feb 06, 2026 - 20:16 vuln.today
Public exploit code
CVE Published
Jan 20, 2026 - 19:15 nvd
CRITICAL 9.8

DescriptionCVE.org

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.

AnalysisAI

PLY (Python Lex-Yacc) library 3.11 has an unsafe feature enabling remote code execution through pickle deserialization of cached parser tables, with EPSS 0.91%.

Technical ContextAI

PLY 3.11 uses Python's pickle module to cache parser tables (CWE-502). Since pickle deserialization can execute arbitrary Python code, an attacker who can write to PLY's cache directory or supply crafted parser tables can achieve code execution.

RemediationAI

Update PLY if a patched version is available. Verify integrity of parser cache files. Run applications with minimal file system permissions.

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 12 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Micro 5.2 Fixed

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CVE-2025-56005 vulnerability details – vuln.today

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