CVE-2026-43898
Published:May 28, 2026
Updated:May 29, 2026
SandboxJS is a JavaScript sandboxing library. Prior to 0.9.6, sandbox-defined functions expose Function.caller, allowing sandboxed code to recover the internal LispType.Call runtime callback. That callback can then be invoked with attacker-controlled fake context and obj values to extract blocked host statics, recover the real host Function constructor, and execute arbitrary host JavaScript. This vulnerability is fixed in 0.9.6.
Affected Packages
https://github.com/nyariv/SandboxJS.git (GITHUB):
Affected version(s) >=v0.8.25 <v0.9.6Fix Suggestion:
Update to version v0.9.6@nyariv/sandboxjs (NPM):
Affected version(s) >=0.1.0 <0.9.6Fix Suggestion:
Update to version 0.9.6@nyariv/sandboxjs (NPM):
Affected version(s) >=0.1.0 <0.9.6Fix Suggestion:
Update to version 0.9.6Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
10
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
HIGH
CVSS v3
Base Score:
10
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Control of Generation of Code ('Code Injection')
EPSS
Base Score:
0.05