PT-2026-55667 · Picklescan · Picklescan

Fredericdt · Published 2026-07-04 · Updated 2026-07-04 · CVE-2025-71343

Mitre

CVSS v3.1

8.1

High

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

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.

Fix

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

CVE-2025-71343

Affected Products

Picklescan

References · 3

• https://github.com/mmaitre314/picklescan/security/advisories/GHSA-p9w7-82w4-7q8m · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-71343 · Security Note
• https://vulncheck.com/advisories/picklescan-arbitrary-code-execution-via-lib2to3-pgen2-pgen-parsergenerator-make-label-detection-bypass · Note