trailofbits fickling up to 0.1.6 cProfile cProfile.run incomplete blacklist

Summaryinfo

A vulnerability labeled as critical has been found in trailofbits fickling up to 0.1.6. Impacted is the function cProfile.run of the component cProfile Module. Executing a manipulation can lead to incomplete blacklist. This vulnerability appears as CVE-2026-22607. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in trailofbits fickling up to 0.1.6. It has been declared as critical. This vulnerability affects the function cProfile.run of the component cProfile Module. The manipulation with an unknown input leads to a incomplete blacklist vulnerability. The CWE definition for the vulnerability is CWE-184. The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete, leading to resultant weaknesses. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Fickling is a Python pickling decompiler and static analyzer. Fickling versions up to and including 0.1.6 do not treat Python's cProfile module as unsafe. Because of this, a malicious pickle that uses cProfile.run() is classified as SUSPICIOUS instead of OVERTLY_MALICIOUS. If a user relies on Fickling's output to decide whether a pickle is safe to deserialize, this misclassification can lead them to execute attacker-controlled code on their system. This affects any workflow or product that uses Fickling as a security gate for pickle deserialization. This issue has been patched in version 0.1.7.

The advisory is available at github.com. This vulnerability was named CVE-2026-22607 since 01/07/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1562.006 by the MITRE ATT&CK project.

Upgrading to version 0.1.7 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch dc8ae12966edee27a78fe05c5745171a2b138d43 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-1687). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Application Server Software

Vendor

• trailofbits

Name

• fickling

Version

• 0.1.0
• 0.1.1
• 0.1.2
• 0.1.3
• 0.1.4
• 0.1.5
• 0.1.6

License

• open-source

Website

• Product: https://github.com/trailofbits/fickling/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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