CVE-2025-67748: fickling Code Injection

Description

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.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-94 CWE-94

CWE-184 CWE-184

CWE-502 Deserialization of Untrusted Data

Affected Products

Vendor	Product	Versions
trailofbits	fickling	< 0.1.6

References

Advisories & Patches

https://github.com/trailofbits/fickling/pull/108 https://github.com/trailofbits/fickling/pull/187 https://github.com/trailofbits/fickling/security/advisories/GHSA-r7v6-mfhq-g3m2

Exploits

https://github.com/trailofbits/fickling/security/advisories/GHSA-r7v6-mfhq-g3m2

Frequently Asked Questions

What is CVE-2025-67748? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-67748? +

CVE-2025-67748 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-67748? +

CVE-2025-67748 affects products from trailofbits, specifically: fickling. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-67748? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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