🛡️ CVE-2026-39911 — guardian

🟠 CVSS 8.8 — High ✅ No Known Exploit CWE-668 NVD
8.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Hashgraph Guardian through version 3.5.1, fixed in commit 45fbe2f, 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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-39911 is classified as CWE-668: Exposure of Resource to Wrong Sphere. A resource is made reachable from a context that should not have access to it.

Affected software

CVE-2026-39911 is recorded against 1 package.

  • guardian (fixed in 3.5.0)

Timeline and source

Published on 9 April 2026 and last revised on 14 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com
github.com
www.vulncheck.com

Details

Severity HIGH
CVSS Score 8.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE CWE-668
Public Exploit ✅ No
Source NVD
Published 2026-04-09
Updated 2026-08-11
Modified 2026-07-14
Fix URL N/A

Affected Packages

Software From version Fixed in
guardian — 3.5.0

Similar Threats

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