CVE-2025-71373 picklescan - Remote Code Execution via operator.methodcaller Detection Bypass
Attackers can bypass picklescan security checks using operator.methodcaller to execute arbitrary code via 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
- None listed
What is CVE-2025-71373?
CVE-2025-71373 is a high-severity unsafe deserialization vulnerability in picklescan, published on 4 Jul 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 0.0.33 fails to detect operator.methodcaller function calls in pickle files, allowing attackers to bypass security checks. Remote attackers can craft malicious pickle payloads using operator.methodcaller that execute arbitrary code when loaded, compromising systems relying on picklescan for validation.
Weakness: CWE-693
Which versions are affected by CVE-2025-71373?
2 open source packages ship an affected version, including picklescan.
| Package | Affected | Fixed in |
|---|---|---|
picklescan PyPI | All versions | 0.0.33 |
picklescan PyPI | All versions | 0.0.33 |
How do I fix CVE-2025-71373?
Upgrade picklescan to 0.0.33 or later.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2025-71373 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-71373 exists.
Sources
Also known as GHSA-9q6q-qv82-8qm9, GHSA-x843-g5mx-g377.