Vulnerability · Published Jul 4, 2026 · Assigned by VulnCheck

CVE-2025-71347picklescan - Undetected Remote Code Execution via numpy.f2py.crackfortran.param_eval

High 8.1

In plain English

A high-severity unsafe deserialization in picklescan from picklescan. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.6%top 52.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

picklescan before 0.0.33 fails to detect malicious pickle files using numpy.f2py.crackfortran.param_eval function in reduce methods, allowing attackers to bypass security checks. Remote attackers can embed undetected code in pickle files that executes during deserialization, enabling arbitrary code execution in applications loading untrusted pickle data.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	picklescan	0.0.33	GHSA-cffc-mxrf-mhh4

Affected products (as reported)

Vendor	Product	Versions
picklescan	picklescan	0 – before 0.0.33

Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

References

GitHub Security Advisory (GHSA-cffc-mxrf-mhh4) vendor-advisory
VulnCheck Advisory: picklescan - Undetected Remote Code Execution via numpy.f2py.crackfortran.param_eval third-party-advisory