CVE-2026-55376

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Source

https://cve.org/CVERecord?id=CVE-2026-55376

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55376.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-55376

Aliases

GHSA-wcgw-9hfw-f6f2

Published

2026-10-13T15:12:49Z

Modified

2026-10-28T02:31:03Z

Severity

8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator

Summary

heym Python Tool Sandbox Escape

Details

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.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-693",
        "CWE-78",
        "CWE-94"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55376.json"
}

References

Affected packages

Git / github.com/heymrun/heym

Affected ranges

Type

GIT

Repo

https://github.com/heymrun/heym

Events

Introduced

Fixed

ecf7ed6911501e2a0936175227ef59e8decb91f6

Fixed

b36d795c6ea841b8f1b511a0952e274487ee4ef3

Database specific

Show details

{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "0.0.40"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "fixed": "b36d795c6ea841b8f1b511a0952e274487ee4ef3"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "v0.0.40",
            "range": [
                {
                    "fixed": "ecf7ed6911501e2a0936175227ef59e8decb91f6"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Affected versions

v0.*

v0.0.1

v0.0.10

v0.0.11

v0.0.12

v0.0.13

v0.0.14

v0.0.15

v0.0.16

v0.0.17

v0.0.18

v0.0.19

v0.0.2

v0.0.20

v0.0.21

v0.0.22

v0.0.23

v0.0.24

v0.0.25

v0.0.26

v0.0.27

v0.0.29

v0.0.3

v0.0.30

v0.0.31

v0.0.32

v0.0.33

v0.0.34

v0.0.35

v0.0.36

v0.0.37

v0.0.38

v0.0.39

v0.0.4

v0.0.5

v0.0.6

v0.0.7

v0.0.8

v0.0.9

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55376.json"