CVE-2025-71351 picklescan - Remote Code Execution via timeit.timeit() Detection Bypass
Attackers can bypass picklescan detection using timeit.timeit() in pickle files to achieve remote code execution when the library processes malicious data.
- 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-2025-71351?
CVE-2025-71351 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 0.0.25 fails to detect malicious pickle files that use timeit.timeit() in the __reduce__ method, allowing remote code execution. Attackers can craft pickle files that import dangerous libraries like os and execute arbitrary system commands, which evade picklescan detection and execute when pickle.load() is called.
Weakness: CWE-184
Which versions are affected by CVE-2025-71351?
3 open source packages ship an affected version, including picklescan.
| Package | Affected | Fixed in |
|---|---|---|
picklescan PyPI | All versions | 0.0.25 |
picklescan PyPI | All versions | 0.0.25 |
picklescan PyPI | All versions | 0.0.25 |
How do I fix CVE-2025-71351?
Upgrade picklescan to 0.0.25 or later.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2025-71351 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-71351 exists.
Sources
Also known as GHSA-v7x6-rv5q-mhwc, PYSEC-2026-4135.