CVE-2026-43898

CRITICAL EPSS 37.3%
Published May 28, 20261mo ago · Modified Jun 17, 20261w ago
10.0 CVSS 3.1
Critical
Find Similar
Published May 28, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

Description

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.

CVSS Details

Base Score
10.0
Exploitability
3.9
Impact
6.0
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Changed
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
37.3% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-94 Improper Control of Generation of Code (Code Injection) Injection

Affected Products 1

VendorProductVersionRange
nyarivsandboxjs* <0.9.6

References 2

  • github.com https://github.com/nyariv/SandboxJS/commit/826865251232611ec94078bab5a18ec875dad4a5
    Patch
  • github.com https://github.com/nyariv/SandboxJS/security/advisories/GHSA-g8f2-4f4f-5jqw
    ExploitVendor Advisory

Remediation

  • github.com https://github.com/nyariv/SandboxJS/commit/826865251232611ec94078bab5a18ec875dad4a5
    Patch