Prototype Pollution

SandboxJS is vulnerable to Prototype Pollution. The vulnerability is due to improper handling of the isGlobal protection flag, where wrapping a host global prototype in an array strips its taint and allows sandboxed code to mutate host built-in prototypes, leading to prototype pollution and...

GHSA-WW7G-4GWX-M7WJ @nyariv/sandboxjs has host prototype pollution from sandbox via array intermediary (sandbox escape)

Summary A sandbox escape vulnerability allows sandboxed code to mutate host built-in prototypes by laundering the isGlobal protection flag through array literal intermediaries. When a global prototype reference e.g., Map.prototype, Set.prototype is placed into an array and retrieved, the isGlobal...

@nyariv/sandboxjs has host prototype pollution from sandbox via array intermediary (sandbox escape)

Summary A sandbox escape vulnerability allows sandboxed code to mutate host built-in prototypes by laundering the isGlobal protection flag through array literal intermediaries. When a global prototype reference e.g., Map.prototype, Set.prototype is placed into an array and retrieved, the isGlobal...

Prototype Pollution

Overview @nyariv/sandboxjs is a Javascript sandboxing library. Affected versions of this package are vulnerable to Prototype Pollution via the sandbox implements a protection mechanism using the isGlobal flag in the Prop class. An attacker can modify host built-in prototypes by laundering the...

CVE-2026-25881

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.31, a sandbox escape vulnerability allows sandboxed code to mutate host built-in prototypes by laundering the isGlobal protection flag through array literal intermediaries. When a global prototype reference e.g., Map.prototype,...

CVE-2026-25881 @nyariv/sandboxjs has host prototype pollution from sandbox via array intermediary (sandbox escape)

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.31, a sandbox escape vulnerability allows sandboxed code to mutate host built-in prototypes by laundering the isGlobal protection flag through array literal intermediaries. When a global prototype reference e.g., Map.prototype,...

CVE-2026-25881

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.31, a sandbox escape vulnerability allows sandboxed code to mutate host built-in prototypes by laundering the isGlobal protection flag through array literal intermediaries. When a global prototype reference e.g., Map.prototype,...

CVE-2026-25881: Improperly Controlled Modification of Object Prototype Attributes

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.31, a sandbox escape vulnerability allows sandboxed code to mutate host built-in prototypes by laundering the isGlobal protection flag through array literal intermediaries. When a global prototype reference e.g., Map.prototype,...