CVE-2026-45227Public exploitNetwork attack vector

Authenticated host command execution via Python introspection

Published May 12, 2026 · Updated May 12, 2026

Sandbox escape in Heym before 0.0.21 allows remote authenticated users to execute host commands through crafted Python tool code. The executor exposes the Python object graph to tool code, letting it traverse subclasses to recover unrestricted import and load blocked modules. Workflow-author privileges are required; commands run as the backend service user, and inherited environment secrets are readable.

CVSS severity8.7
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sandbox escape in Heym before 0.0.21 allows remote authenticated users to execute host commands through crafted Python tool code. The executor exposes the Python object graph to tool code, letting it traverse subclasses to recover unrestricted import and load blocked modules. Workflow-author privileges are required; commands run as the backend service user, and inherited environment secrets are readable.

The record

CVE
CVE-2026-45227
Published
May 12, 2026
Updated
May 12, 2026
Vendor
Heym
Product
Heym
Classifications
CWE-693, T1059.006
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.0.21

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Heym · Heymversion=0 <0.0.21

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-693Protection Mechanism Failure
T1059.006Command and Scripting Interpreter: Python

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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