CVE-2026-45227
Heym < 0.0.21 Sandbox Escape via Python Introspection
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-693 |
| Vendor | heymrun |
| Product | heym |
| Published | May 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
heymrun / heym
0 < 0.0.21
References
github.com: https://github.com/heymrun/heym/releases/tag/v0.0.21 github.com: https://github.com/heymrun/heym/pull/94 github.com: https://github.com/heymrun/heym/commit/32b7e809d987d9b018ec8daa2cdaf48f627f26f1 vulncheck.com: https://www.vulncheck.com/advisories/heym-sandbox-escape-via-python-introspection
Credits
Chia Min Jun Lennon