heymrun heym up to 0.0.20 Backend Service __import__ protection mechanism

Summaryinfo

A vulnerability described as critical has been identified in heymrun heym up to 0.0.20. This impacts the function __import__ of the component Backend Service. The manipulation results in protection mechanism. This vulnerability was named CVE-2026-45227. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in heymrun heym up to 0.0.20. Affected is the function __import__ of the component Backend Service. The manipulation with an unknown input leads to a protection mechanism vulnerability. CWE is classifying the issue as CWE-693. The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Heym before 0.0.21 contains a sandbox escape vulnerability in the custom Python tool executor that allows authenticated workflow authors to bypass sandbox restrictions by using object-graph introspection primitives. Attackers can use Python introspection techniques to recover the unrestricted __import__ function, import blocked modules such as os and subprocess, and access inherited backend environment variables containing database credentials and encryption keys to execute arbitrary host commands as the backend service user.

The weakness was presented by Chia Min Jun Lennon. The advisory is available at github.com. This vulnerability is traded as CVE-2026-45227 since 05/11/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit.

Upgrading to version 0.0.21 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 32b7e809d987d9b018ec8daa2cdaf48f627f26f1 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.

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Productinfo

Vendor

• heymrun

Name

• heym

Version

• 0.0.1
• 0.0.2
• 0.0.3
• 0.0.4
• 0.0.5
• 0.0.6
• 0.0.7
• 0.0.8
• 0.0.9
• 0.0.10
• 0.0.11
• 0.0.12
• 0.0.13
• 0.0.14
• 0.0.15
• 0.0.16
• 0.0.17
• 0.0.18
• 0.0.19
• 0.0.20

License

• open-source

Website

• Product: https://github.com/heymrun/heym/

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