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Vulnerability record · CVE-2025-71343 · published 4 July 2026

CVE-2025-71343: Deserialization of untrusted data vulnerability

picklescan before 0.0.30 fails to detect malicious pickle files that exploit lib2to3.pgen2.pgen.ParserGenerator.make_label function in the reduce method. Attackers can craft malicious pickle files with embedded code that evades detection but executes arbitrary commands when pickle.load() is called.

7.6 CVSS 4.0 High EPSS 0.43% · top 65.1% CWE-502 · Deserialization of untrusted data Deferred
7.6CVSS 4.0 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
7 Jul 2026Last modified by NVD

Description

picklescan before 0.0.30 fails to detect malicious pickle files that exploit lib2to3.pgen2.pgen.ParserGenerator.make_label function in the reduce method. Attackers can craft malicious pickle files with embedded code that evades detection but executes arbitrary commands when pickle.load() is called.

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-p9w7-82w4-7q8m
https://www.vulncheck.com/advisories/picklescan-arbitrary-code-execution-via-lib2to3-pgen2-pgen-parsergenerator-make-lab
https://github.com/mmaitre314/picklescan/security/advisories/GHSA-p9w7-82w4-7q8m

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Source: NIST National Vulnerability Database (record CVE-2025-71343), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.