CVE Tools
Sign in

CVE-2026-39911

Hashgraph Guardian 3.5.1 Unsandboxed JavaScript Execution RCE

Published: Apr 9, 2026Updated: May 1, 2026 Sources: CVE List NVDCWE-668
NVD MITRE
8.8CVSSHIGH
EPSS Score
0.5%
Top 58.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-668

Affected Products

guardianhashgraph
SaaS
Cloud & SaaS / cloud-platform
guardianhedera
SaaS
Cloud & SaaS / cloud-platform
hashgraphcommercialCloud & SaaSaka guardian
hederacommercialCloud & SaaSaka guardian

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://github.com/hashgraph/guardian/pull/5929
github.com
https://github.com/hashgraph/guardian/commit/45fbe2f7e0e8feee30105d42d66ed63fb6177ebe
github.com
https://www.vulncheck.com/advisories/hashgraph-guardian-unsandboxed-javascript-execution-rce
vulncheck.com

Timeline

Published
Apr 9, 2026
Last Updated
May 1, 2026

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2026-39911 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows