Hashgraph Guardian 3.5.0 Unsandboxed JavaScript Execution RCE_CVE-2026-39911

8.7 / 10

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

Description

Hashgraph Guardian through version 3.5.0 contains an unsandboxed JavaScript execution vulnerability in the Custom Logic policy block worker that allows authenticated Standard Registry users to execute arbitrary code by passing user-supplied JavaScript expressions directly to the Node.js Function() constructor without isolation. Attackers can import native Node.js modules to read arbitrary files from the container filesystem, access process environment variables containing sensitive credentials such as RSA private keys, JWT signing keys, and API tokens, and forge valid authentication tokens for any user including administrators.

Basic Information

ID CVE-2026-39911

Source VulnCheck

Published Apr 9, 2026 at 17:57

Modified Apr 9, 2026 at 18:20

Affected Product

Vendor hashgraph

Product guardian

Affected Versions hashgraph guardian 0

CWE Classification

CWE-668

References

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    "published": "2026-04-09T17:57:20.440Z",
    "modified": "2026-04-09T18:20:09.279Z",
    "type": "cve",
    "title": "Hashgraph Guardian 3.5.0 Unsandboxed JavaScript Execution RCE",
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    "references": "https://github.com/hashgraph/guardian/pull/5929\nhttps://www.vulncheck.com/advisories/hashgraph-guardian-unsandboxed-javascript-execution-rce",
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