FKIE_CVE-2026-55376

Vulnerability from fkie_nvd - Published: 2026-10-13 16:17 - Updated: 2026-10-16 22:17
Severity
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
Heym builds and runs agentic systems and business-process automations on self-hosted infrastructure. Prior to 0.0.40, an authenticated user who can create or edit a workflow with an Agent custom Python tool can bypass the blacklist-based sandbox in backend/app/services/python_tool_executor.py because allowed standard-library modules expose operating-system, process, and filesystem capabilities through public attributes that pass _safe_import() and _validate_code_safety(). The runner then executes the supplied tool with exec(), permitting commands and file operations as the backend application user; self-registration affects reachability, but portal triggering alone does not grant code control. This issue is fixed in 0.0.40.
References
security-advisories@github.comhttps://github.com/heymrun/heym/commit/b36d795c6ea841b8f1b511a0952e274487ee4ef3
security-advisories@github.comhttps://github.com/heymrun/heym/releases/tag/v0.0.40
security-advisories@github.comhttps://github.com/heymrun/heym/security/advisories/GHSA-wcgw-9hfw-f6f2
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/heymrun/heym/security/advisories/GHSA-wcgw-9hfw-f6f2
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "heym",
          "vendor": "heymrun",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.0.40"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Heym builds and runs agentic systems and business-process automations on self-hosted infrastructure. Prior to 0.0.40, an authenticated user who can create or edit a workflow with an Agent custom Python tool can bypass the blacklist-based sandbox in backend/app/services/python_tool_executor.py because allowed standard-library modules expose operating-system, process, and filesystem capabilities through public attributes that pass _safe_import() and _validate_code_safety(). The runner then executes the supplied tool with exec(), permitting commands and file operations as the backend application user; self-registration affects reachability, but portal triggering alone does not grant code control. This issue is fixed in 0.0.40."
    }
  ],
  "id": "CVE-2026-55376",
  "lastModified": "2026-10-16T22:17:23.847",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-55376",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-16T22:00:21.840218Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-13T16:17:21.720",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/heymrun/heym/commit/b36d795c6ea841b8f1b511a0952e274487ee4ef3"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/heymrun/heym/releases/tag/v0.0.40"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/heymrun/heym/security/advisories/GHSA-wcgw-9hfw-f6f2"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/heymrun/heym/security/advisories/GHSA-wcgw-9hfw-f6f2"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-78"
        },
        {
          "lang": "en",
          "value": "CWE-94"
        },
        {
          "lang": "en",
          "value": "CWE-693"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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