Staging Environment: Content and features may be unstable or change without notice.
Advisory details: pypa / picklescan/PYSEC-2026-1786
Advisory ID pypa/picklescan/PYSEC-2026-1786
Aliases CVE-2025-71361
GHSA-8r4j-24qv-fmq9
PYSEC-2026-1786
Summary Picklescan has a missing detection when calling built-in python idlelib.calltip.Calltip ### Summary Using idlelib.calltip.Calltip.fetch_tip, 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 idlelib.calltip.Calltip.fetch_tip 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 ``` class EvilCalltipFetchTip: def __reduce__(self): from idlelib.calltip import Calltip # fetch_tip(expression) -> get_entity(expression) -> eval(expression) return Calltip().fetch_tip, ("__import__('os').system('whoami')",) ``` ### 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/aecd11be98702caa9ba9b12189d91ad596a36114
https://pypi.org/project/picklescan
CVE-2025-71361 https://nvd.nist.gov/vuln/detail/CVE-2025-71361
GHSA-8r4j-24qv-fmq9 https://github.com/advisories/GHSA-8r4j-24qv-fmq9
GHSA-8r4j-24qv-fmq9 https://github.com/mmaitre314/picklescan/security/advisories/GHSA-8r4j-24qv-fmq9
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:T/P:M/B:A/M:M/D:R/2026-06-24T16:02:09Z/

Decision: Track*

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2025/71xxx/CVE-2025-71361.json

Source Advisory: vulnrichment/CVE-2025-71361

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