CVE-2025-71376 picklescan - Arbitrary Code Execution via Undetected idlelib.autocomplete.AutoComplete.fetch_completions
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-2025-71376?
CVE-2025-71376 is a high-severity unsafe deserialization vulnerability in picklescan, published on 23 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 0.0.29 fails to detect malicious pickle files using idlelib.autocomplete.AutoComplete.fetch_completions in reduce methods. Attackers can embed undetected code in pickle files that executes arbitrary commands when loaded by victims.
Weakness: CWE-502
Which versions are affected by CVE-2025-71376?
3 open source packages ship an affected version, including picklescan.
| Package | Affected | Fixed in |
|---|---|---|
picklescan PyPI | All versions | 0.0.29 |
picklescan PyPI | All versions | 0.0.29 |
picklescan PyPI | All versions | 0.0.29 |
How do I fix CVE-2025-71376?
Upgrade picklescan to 0.0.29 or later.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2025-71376 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-71376 exists.
Sources
Also known as GHSA-7cq8-mj8x-j263, PYSEC-2026-4133.