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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.

PUBLISHED Reserved 2026-04-07 | Published 2026-04-09 | Updated 2026-05-01 | Assigner VulnCheck




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

HIGH: 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-668: Exposure of Resource to Wrong Sphere

Product status

Default status
unknown

Any version
affected

45fbe2f7e0e8feee30105d42d66ed63fb6177ebe (git)
unaffected

Credits

Christ Bouchuen finder

References

github.com/hashgraph/guardian/pull/5929 issue-tracking mitigation

github.com/...ommit/45fbe2f7e0e8feee30105d42d66ed63fb6177ebe patch

www.vulncheck.com/...an-unsandboxed-javascript-execution-rce third-party-advisory

cve.org (CVE-2026-39911)

nvd.nist.gov (CVE-2026-39911)

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