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Vulnerabilities CVE-2026-45227

CVE-2026-45227

High
Open
TLP:CLEAR

Heym < 0.0.21 Sandbox Escape via Python Introspection

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Description

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.

Details

CVSS Score
8.7
EPSS Score
0.23%

13.6th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Confidence
90%
Published
May 12, 2026
Last Modified
Jul 14, 2026
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