Vulnerability-Lookup

GHSA-VHHJ-J98H-XX8P

Vulnerability from github – Published: 2026-05-13 00:48 – Updated: 2026-05-13 00:48

Details

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.

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

8.7 (High)


                  
                    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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-45227"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-693"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-12T22:16:38Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-vhhj-j98h-xx8p",
  "modified": "2026-05-13T00:48:14Z",
  "published": "2026-05-13T00:48:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45227"
    },
    {
      "type": "WEB",
      "url": "https://github.com/heymrun/heym/pull/94"
    },
    {
      "type": "WEB",
      "url": "https://github.com/heymrun/heym/commit/32b7e809d987d9b018ec8daa2cdaf48f627f26f1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/heymrun/heym/releases/tag/v0.0.21"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/heym-sandbox-escape-via-python-introspection"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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/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",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-45227 (GCVE-0-2026-45227)

Vulnerability from cvelistv5 – Published: 2026-05-12 21:18 – Updated: 2026-07-14 20:01 X_Open Source

Title

Heym < 0.0.21 Sandbox Escape via Python Introspection

Summary

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.

Severity

8.7 (High)


                        
                          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

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-14 12:33 UTC

CWE

CWE-693 - Protection Mechanism Failure

Assigner

VulnCheck mitre root Scorecard

References

4 references

URL	Tags
https://github.com/heymrun/heym/releases/tag/v0.0.21	release-notes
https://github.com/heymrun/heym/pull/94	issue-tracking
https://github.com/heymrun/heym/commit/32b7e809d9…	patch
https://www.vulncheck.com/advisories/heym-sandbox…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
heymrun	heym	Affected: 0 , < 0.0.21 (semver) Unaffected: 32b7e809d987d9b018ec8daa2cdaf48f627f26f1 (git)

Date Public

2026-05-09 00:00

Credits

Chia Min Jun Lennon

Show details on NVD website

JSON

To clipboard

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  "containers": {
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        "metrics": [
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                "id": "CVE-2026-45227",
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                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-14T12:33:16.358963Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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          "dateUpdated": "2026-05-14T12:33:20.477Z",
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            "tags": [
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          }
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          "defaultStatus": "affected",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-VHHJ-J98H-XX8P

CVE-2026-45227 (GCVE-0-2026-45227)

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