CVE-2026-26954

CRITICAL

SandboxJS < 0.8.34 - Sandbox Escape via Function Array Manipulation

Title source: llm
STIX 2.1

Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.34, it is possible to obtain arrays containing Function, which allows escaping the sandbox. Given an array containing Function, and Object.fromEntries, it is possible to construct {[p]: Function} where p is any constructible property. This vulnerability is fixed in 0.8.34.

References (1)

Core 1
Core References

Scores

CVSS v3 10.0
EPSS 0.0055
EPSS Percentile 41.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact total

Details

CWE
CWE-94
Status published
Products (3)
nyariv/sandboxjs < 0.8.34
nyariv/sandboxjs 0 - 0.8.34npm
nyariv/SandboxJS < 0.8.34
Published Mar 13, 2026
Tracked Since Mar 14, 2026