CVE-2026-22686: Host Realm Error Sandbox Prototype Chain Escape
Throwing a host-realm `new Error()` at a VM/sandbox boundary exposes the full host prototype chain to sandboxed code. Sandboxed code catching this Error can traverse Error -> Error.prototype -> Error constructor -> Function constructor to reach the host Function constructor and execute arbitrary JavaScript in the host process, achieving full sandbox escape (
TSgreprules fetch cve-2026-22686-host-realm-error-sandbox-prototype-chain-escape --engine opengrepDescription
Throwing a host-realm `new Error()` at a VM/sandbox boundary exposes the full host prototype chain to sandboxed code. Sandboxed code catching this Error can traverse Error -> Error.prototype -> Error constructor -> Function constructor to reach the host Function constructor and execute arbitrary JavaScript in the host process, achieving full sandbox escape (
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