CVE-2025-71359

picklescan - Unsafe Deserialization via lib2to3.pgen2.grammar.Grammar.loads

State: Published
Severity: 7.6 High
Published: Jul 4, 2026
Updated: Jul 6, 2026
Reserved: Jun 20, 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.

Scores

CVSS	Score	Vector	Source
4.0	7.6 High	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N	VulnCheck
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N	VulnCheck

Weaknesses

CWE-502 Deserialization of Untrusted Data

Affected Products

Product	Versions
picklescanpicklescan	before 0.0.29Affected 0.0.29Not affected

References

GitHub Security Advisory (GHSA-f54q-57x4-jg88)vendor-advisory
VulnCheck Advisory: picklescan - Unsafe Deserialization via lib2to3.pgen2.grammar.Grammar.loadsthird-party-advisory

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