CVE-2025-71344 picklescan - Arbitrary Code Execution via Undetected ensurepip._run_pip Function
Attackers can execute arbitrary code by bypassing picklescan detection using ensurepip._run_pip in malicious pickle files.
- 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-2025-71344?
CVE-2025-71344 is a high-severity unsafe deserialization vulnerability in picklescan, published on 22 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 (affected versions 0.0.26 and earlier) fails to detect the ensurepip._run_pip built-in function when scanning pickle files, allowing attackers to execute arbitrary code. Malicious pickle files embedding ensurepip._run_pip calls in __reduce__ methods bypass picklescan detection and achieve remote code execution upon pickle.load() invocation.
Weakness: CWE-502
Which versions are affected by CVE-2025-71344?
3 open source packages ship an affected version, including picklescan.
| 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 |
How do I fix CVE-2025-71344?
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-2025-71344 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-71344 exists.
Sources
Also known as GHSA-xp4f-hrf8-rxw7, PYSEC-2026-1792.