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Vulnerabilities

Vulnerability · CVE-2025-56005

An undocumented and unsafe feature in the PLY (Python Lex-Yacc) library 3.11 allows Remote Code Execution (RCE) via the parameter in the function.

Published Jan 20, 2026 · catalog updated Sep 17, 2026 · An undocumented and unsafe

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check this week

CVE-2025-56005 is not in CISA KEV. FIRST estimates a 18.81% chance of exploitation in the next 30 days. Check whether you run An undocumented and unsafe.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (An undocumented and unsafe).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
18.81%
Remediation
Vendor / distro source
Affected products
vendor n/a n/a n/a

An undocumented and unsafe feature in the PLY (Python Lex-Yacc) library 3.11 allows Remote Code Execution (RCE) via the parameter in the function. This parameter accepts a file that is deserialized with without validation. Because allows execution of embedded code via , 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 becau

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor n/a n/a n/an/a

How to fix CVE-2025-56005

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-56005 is not in CISA KEV. FIRST estimates a 18.81% chance of exploitation in the next 30 days. Check whether you run An undocumented and unsafe.

Which versions are affected?

Compare what you have installed with n/a n/a n/a n/a. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 18.81%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 20, 2026 · EUVD

    Detected

    An undocumented and unsafe feature in the PLY (Python Lex-Yacc) library 3.11 allows Remote Code Execution (RCE) via the parameter in the function. This parameter accepts a file that is deserialized with without validation. Because allows execution of embedded code via , an attacker can achieve code execution by passing a malicious pickle file. The parameter is not mentioned in official documentati

  2. Sep 17, 2026 · EUVD

    Updated

    An undocumented and unsafe feature in the PLY (Python Lex-Yacc) library 3.11 allows Remote Code Execution (RCE) via the parameter in the function. This parameter accepts a file that is deserialized with without validation. Because allows execution of embedded code via , an attacker can achieve code execution by passing a malicious pickle file. The parameter is not mentioned in official documentati

Sources

  • CVE.orgVulnerability recordCVE-2025-56005

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-56005

    30-day exploitation probability 18.81%

    first.org
  • EUVDVulnerability recordEUVD-2026-3342

    An undocumented and unsafe feature in the PLY (Python Lex-Yacc) library 3.11 allows Remote Code Execution (RCE) via the parameter in the function. This parameter accepts a file that is deserialized with without validation. Because allows execution of embedded code via , an attack

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 5, 2026
  • CVE.orgNov 4, 2026
  • EUVDNov 2, 2026