7.1

CVSS Score

4.0

-

CVSS Score

Basic Information

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CVE-2025-67748

CVE-2025-67748: Fickling has Code Injection vulnerability via pty.spawn()

Fickling is a Python pickling decompiler and static analyzer. Versions prior to 0.1.6 had a bypass caused by pty missing from the block list of unsafe module imports. This led to unsafe pickles based on pty.spawn() being incorrectly flagged as LIKELY_SAFE, and was fixed in version 0.1.6. This impacted any user or system that used Fickling to vet pickle files for security issues.

(GitHub Advisory)

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CVE-2025-67748

CVE-2025-67748:

7.1

CVSS Score

4.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
fickling	pip	< 0.1.6	0.1.6

Technical Details

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Root Cause Analysis

The vulnerability description explicitly states that the issue is due to 'pty' being missing from a blocklist of unsafe module imports. The fix, located in pull request #187, confirms this. The primary commit fd636fbf03ab6ce0b497558787c418a2c22c454a adds 'pty' to a hardcoded tuple of unsafe module names within the unsafe_imports method of the Pickled class in fickling/fickle.py. This function is responsible for iterating through the abstract syntax tree of a pickle file and identifying imports that are considered dangerous. The vulnerability lies in the incompleteness of this check, which the patch rectifies. Therefore, Pickled.unsafe_imports is the function that contains the vulnerability.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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