CVE-2025-71357 picklescan - Arbitrary Code Execution via Undetected idlelib.pyshell.ModifiedInterpreter.runcommand

High 7.6 Published 21 Jun 2026 Updated 22 Jun 2026

Attackers can execute arbitrary code by crafting malicious pickle files that bypass picklescan's detection mechanisms.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2025-71357?

CVE-2025-71357 is a high-severity unsafe deserialization vulnerability in picklescan, published on 21 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

picklescan before 0.0.30 fails to detect malicious pickle files using idlelib.pyshell.ModifiedInterpreter.runcommand in reduce methods. Attackers can embed undetected code in pickle files that executes remote commands when loaded by victims.

Weakness: CWE-502

Which versions are affected by CVE-2025-71357?

3 open source packages ship an affected version, including picklescan. It affects 1 product.

Package	Affected	Fixed in
`picklescan` PyPI	All versions	`0.0.30`
`picklescan` PyPI	All versions	`0.0.30`
`picklescan` PyPI	All versions	`0.0.30`

Products include Mmaitre314 Picklescan.

How do I fix CVE-2025-71357?

Upgrade picklescan to 0.0.30 or later.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2025-71357 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-71357 exists.

Sources

Also known as GHSA-j343-8v2j-ff7w, PYSEC-2026-246.