CVE-2025-71365: picklescan - Arbitrary Code Execution via numpy.f2py.crackfortran.myeval Detection Bypass

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-23 · updated 2026-10-12
Weakness: CWE-502

Description

picklescan before 0.0.33 fails to detect malicious pickle files that invoke numpy.f2py.crackfortran.myeval function through the reduce method. Attackers can craft malicious pickle files embedding arbitrary code that evades picklescan detection and executes remote code when loaded.

Affected products

picklescan: before 0.0.33 — fixed in 0.0.33

How to fix

Upgrade to a fixed version: picklescan 0.0.33. Check the vendor advisory for mitigations.

References

https://github.com/mmaitre314/picklescan/security/advisories/GHSA-3329-ghmp-jmv5
https://www.vulncheck.com/advisories/picklescan-arbitrary-code-execution-via-numpy-f2py-crackfortran-myeval-detection-bypass
https://github.com/mmaitre314/picklescan/security/advisories/GHSA-3329-ghmp-jmv5

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