Vulnerability · Published Jun 22, 2026 · Assigned by VulnCheck
CVE-2025-71339Picklescan - Arbitrary Code Execution via numpy.f2py.crackfortran._eval_length Gadget
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 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.4%top 67.7% 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 the numpy.f2py.crackfortran._eval_length gadget in pickle __reduce__ methods, allowing arbitrary code execution. Attackers can craft malicious pickle files that execute arbitrary Python code when loaded by victims who trust Picklescan's safety validation.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | picklescan | 0.0.33 | GHSA-6556-fwc2-fg2p |
| PyPI | picklescan | 0.0.33 | PYSEC-2026-1783 |
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