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NVD HIGH: CVE-2026-39911 — Hashgraph Guardian through version 3.5.0 contains an unsandboxed JavaScript exec...

·Source: NIST NVD

Updated:

Executive Summary

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 fr

Analysis

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. CVSS Score: 8.8. Published: 2026-04-09T18:17:01.870.

Indicators of Compromise (1)

CVE (1)
CVE-2026-39911
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Apr 9, 2026. Verified by: NIST.

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