CVE-2025-71359 HIGH

CVE-2025-71359: picklescan - Unsafe Deserialization via lib2to3.pgen2.grammar.Grammar.loads

Vendor Picklescan

Product picklescan

Weakness CWE-502 · Unsafe deserialization

Published July 4, 2026

Last update July 4, 2026

View on NVD All CVEs

CVSS base score

7.6/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction —

Confidentiality —

Integrity —

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

July 4, 2026 CVE published

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2025-71359 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/502.html AskarLabs — CWE-502 write-up Deserialization of Untrusted Data

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04Related CVE

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