CVE-2026-45227
Heym < 0.0.21 Sandbox Escape via Python Introspection
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.
INFO
Published Date :
May 12, 2026, 10:16 p.m.
Last Modified :
Oct. 26, 2026, 2:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-45227
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Heym to version 0.0.21 or later.
- Review and restrict authenticated workflow author permissions.
- Disable object-graph introspection primitives if possible.
- Audit imported modules and executed commands.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-45227.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-45227 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-45227
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-45227 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-45227 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 26, 2026
Action Type Old Value New Value Added Translation Title: heym de heymrun, Description: Heym anterior a 0.0.21 contiene una vulnerabilidad de escape de sandbox en el ejecutor de herramientas Python personalizado que permite a los autores de flujos de trabajo autenticados eludir las restricciones de la sandbox mediante el uso de primitivas de introspección de grafos de objetos. Los atacantes pueden usar técnicas de introspección de Python para recuperar la función __import__ sin restricciones, importar módulos bloqueados como os y subprocess, y acceder a variables de entorno de backend heredadas que contienen credenciales de base de datos y claves de cifrado para ejecutar comandos de host arbitrarios como el usuario del servicio de backend. -
CVE Modified by [email protected]
Jul. 14, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://github.com/heymrun/heym', 'vendor': 'heymrun', 'product': 'heym', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '0.0.21', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '32b7e809d987d9b018ec8daa2cdaf48f627f26f1', 'versionType': 'git'}], 'defaultStatus': 'affected'}] [{'repo': 'https://github.com/heymrun/heym', 'vendor': 'heymrun', 'product': 'heym', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '0.0.21', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '32b7e809d987d9b018ec8daa2cdaf48f627f26f1', 'versionType': 'git'}], 'packageURL': 'pkg:github/heymrun/heym', 'defaultStatus': 'affected'}] -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/heymrun/heym', 'vendor': 'heymrun', 'product': 'heym', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '0.0.21', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '32b7e809d987d9b018ec8daa2cdaf48f627f26f1', 'versionType': 'git'}], 'defaultStatus': 'affected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-45227', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-05-14T12:33:16.358963Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 14, 2026
Action Type Old Value New Value Added Reference https://github.com/heymrun/heym/pull/94 -
New CVE Received by [email protected]
May. 12, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-693 Added Reference https://github.com/heymrun/heym/commit/32b7e809d987d9b018ec8daa2cdaf48f627f26f1 Added Reference https://github.com/heymrun/heym/pull/94 Added Reference https://github.com/heymrun/heym/releases/tag/v0.0.21 Added Reference https://www.vulncheck.com/advisories/heym-sandbox-escape-via-python-introspection