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Vulnerability record · CVE-2025-71359 · published 4 July 2026

CVE-2025-71359: Deserialization of untrusted data vulnerability

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.

7.6 CVSS 4.0 High EPSS 0.61% · top 52.8% CWE-502 · Deserialization of untrusted data Deferred
7.6CVSS 4.0 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
6 Jul 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/mmaitre314/picklescan/security/advisories/GHSA-f54q-57x4-jg88
https://www.vulncheck.com/advisories/picklescan-unsafe-deserialization-via-lib2to3-pgen2-grammar-grammar-loads
https://github.com/mmaitre314/picklescan/security/advisories/GHSA-f54q-57x4-jg88

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Source: NIST National Vulnerability Database (record CVE-2025-71359), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.