Ghostwire

CVE-2025-71359: picklescan before 0.0.29 fails to detect malicious pickle payloads that utilize lib2to3.pgen2.grammar.Grammar.loads in...

HIGH CVSS 8.1 Exploit Available

Published: July 4, 2026 | Last Modified: July 4, 2026

Description

picklescan before 0.0.29 fails to detect malicious pickle payloads that utilize lib2to3.pgen2.grammar.Grammar.loads in the reduce method, allowing remote code execution. Attackers can craft pickle files embedding dangerous code that evades picklescan detection and executes during pickle.load() deserialization.

Ghostwire Analysis — What This Means Practically

High CVSS score indicates significant risk — exploitation could lead to substantial data exposure or system compromise.
Exploit code is reported to be available, increasing the likelihood of active exploitation.

This analysis is generated by Ghostwire from NVD, CISA KEV, EPSS, and open-source intelligence data. Verify findings through primary sources before acting.

References

github.com/mmaitre314/picklescan/security/advisories/GHSA-f54q-57x4-jg88
www.vulncheck.com/advisories/picklescan-unsafe-deserialization-via-lib2to3-pgen2
www.tenable.com/cve/CVE-2025-71359
www.cnnvd.org.cn/home/globalSearch?keyword=CVE-2025-71359