CVE-2025-10156 PickleScan Security Bypass via Bad CRC in ZIP Archive

Critical 9.3 Published 17 Sep 2025 Updated 17 Sep 2025

Attackers can bypass pickle scanning by using ZIP files with bad CRCs, leading to malicious code execution when the unsafe file is loaded.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2025-10156?

CVE-2025-10156 is a critical vulnerability in mmaitre314 picklescan, published on 17 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An Improper Handling of Exceptional Conditions vulnerability in the ZIP archive scanning component of mmaitre314 picklescan allows a remote attacker to bypass security scans. This is achieved by crafting a ZIP archive containing a file with a bad Cyclic Redundancy Check (CRC), which causes the scanner to halt and fail to analyze the contents for malicious pickle files. When the file incorrectly considered safe is loaded, it can lead to the execution of malicious code.

Weakness: CWE-755

Which versions are affected by CVE-2025-10156?

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

Package	Affected	Fixed in
`picklescan` PyPI	All versions	`0.0.31`
`picklescan` PyPI	All versions	`0.0.31`
`picklescan` PyPI	All versions	`0.0.31`

Products include Mmaitre314 Picklescan.

How do I fix CVE-2025-10156?

Upgrade picklescan to 0.0.31 or later.

Is CVE-2025-10156 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-10156 exists.

Sources

Also known as GHSA-mjqp-26hc-grxg, PYSEC-2025-152.