CVE-2025-71356 picklescan - Arbitrary Code Execution via torch.fx.experimental.symbolic_shapes.ShapeEnv.evaluate_guards_expression
Attackers can execute arbitrary code by embedding 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
- None listed
What is CVE-2025-71356?
CVE-2025-71356 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 0.0.28 fails to detect malicious torch.fx.experimental.symbolic_shapes.ShapeEnv.evaluate_guards_expression function calls in pickle files. Attackers can embed undetected code in pickle files that executes remote code when loaded by victims.
Weakness: CWE-502
Which versions are affected by CVE-2025-71356?
2 open source packages ship an affected version, including picklescan.
| Package | Affected | Fixed in |
|---|---|---|
picklescan PyPI | All versions | 0.0.28 |
picklescan PyPI | All versions | 0.0.28 |
How do I fix CVE-2025-71356?
Upgrade picklescan to 0.0.28 or later.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2025-71356 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-71356 exists.
Sources
Also known as GHSA-f4x7-rfwp-v3xw, GHSA-gpmh-464g-j3r8.