CVE-2026-34217: medium-severity vulnerability in nyariv SandboxJS
SandboxJS has a Sandbox Escape via Prop Object Leak in New Handler
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.9epss 0.3%
SandboxJS is a JavaScript sandboxing library. Prior to 0.8.36, a scope modification vulnerability exists in @nyariv/sandboxjs. The vulnerability allows untrusted sandboxed code to leak internal interpreter objects through the new operator, exposing sandbox scope objects in the scope hierarchy to untrusted code; an unexpected and undesired exploit. While this could allow modifying scopes inside the sandbox, code evaluation remains sandboxed and prototypes remain protected throughout the execution. This vulnerability is fixed in 0.8.36.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
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%