Staging Environment: Content and features may be unstable or change without notice.
Advisory details: pypa / picklescan/PYSEC-2026-1792
Advisory ID pypa/picklescan/PYSEC-2026-1792
Aliases CVE-2025-71344
GHSA-xp4f-hrf8-rxw7
PYSEC-2026-1792
Summary Picklescan is missing detection when calling built-in python ensurepip._run_pip ### 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
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (0)
There are no known CWE.
System Score Found at
There are no known severity scores.
Reference id Reference type URL
https://github.com/mmaitre314/picklescan
https://github.com/mmaitre314/picklescan/commit/1931c2d04eaca8d20597705ff39cab78ba364e4b
https://pypi.org/project/picklescan
CVE-2025-71344 https://nvd.nist.gov/vuln/detail/CVE-2025-71344
GHSA-xp4f-hrf8-rxw7 https://github.com/advisories/GHSA-xp4f-hrf8-rxw7
GHSA-xp4f-hrf8-rxw7 https://github.com/mmaitre314/picklescan/security/advisories/GHSA-xp4f-hrf8-rxw7
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
There are no known vectors.

Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-06-23T18:22:22Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2025/71xxx/CVE-2025-71344.json

Source Advisory: vulnrichment/CVE-2025-71344

View SSVC decision tree 
[{'Exploitation': 'poc'},
 {'Automatable': 'no'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]