CVE-2026-26954: critical vulnerability in nyariv SandboxJS
SandboxJS has a Sandbox Escape
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 10epss 0.6%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Affected products
nyariv · SandboxJSRelated CVEs — nyariv SandboxJS
In the same product, most dangerous first.
CVE-2026-23830CRITICALSandboxJS has Sandbox Escape via Unprotected AsyncFunction ConstructorEPSS 1.2%CVE-2026-25142CRITICALSandboxJS Prototype Pollution -> Sandbox Escape -> RCEEPSS 1.2%CVE-2026-25520CRITICALSandboxJS has a Sandbox EscapeEPSS 0.9%CVE-2026-25587CRITICALSandboxJS has a Sandbox EscapeEPSS 0.7%CVE-2026-25586CRITICALSandboxJS has a Sandbox Escape via Prototype Whitelist Bypass and Host Prototype PollutionEPSS 0.7%CVE-2026-25881CRITICAL@nyariv/sandboxjs has host prototype pollution from sandbox via array intermediary (sandbox escape)EPSS 0.6%