Threat Intelligence Database

SandboxJS is a JavaScript sandboxing library. Prior to 0.9.6, sandbox-defined functions expose Function.caller, allowing sandboxed code to recover the internal LispType.Call runtime callback. That callback can then be invoked with attacker-controlled fake context and obj values to extract blocked host statics, recover the real host Function constructor, and execute arbitrary host JavaScript. This vulnerability is fixed in 0.9.6.

CVE-2026-34211 is a medium severity vulnerability in the nyariv SandboxJS JavaScript sandboxing library versions prior to 0.8.36. It involves uncontrolled recursion in the parser's restOfExp function and the lispify/lispifyExpr call chain. An attacker can cause a Node.js process to crash by supplying deeply nested expressions, triggering a RangeError due to maximum call stack size exceeded. This results in denial of service by terminating the affected process. The issue is fixed in version 0.8.36.

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.36, SandboxJS blocks direct assignment to global objects (for example Math.random = ...), but this protection can be bypassed through an exposed callable constructor path: this.constructor.call(target, attackerObject). Because this.constructor resolves to the internal SandboxGlobal function and Function.prototype.call is allowed, attacker code can write arbitrary properties into host global objects and persist those mutations across sandbox instances in the same process. This vulnerability is fixed in 0.8.36.

CVE-2026-32723 is a medium-severity race condition vulnerability in SandboxJS versions prior to 0.8.35. It arises from improper synchronization of a shared global tick state used to enforce execution quotas across concurrent sandboxes. An attacker controlling one sandbox can manipulate the global tick state to bypass the execution quota/watchdog of another sandbox, potentially allowing excessive or unauthorized code execution. Exploitation requires local access with low privileges but no user interaction. The vulnerability affects multi-tenant or concurrent sandbox environments using vulnerable SandboxJS versions. No known exploits are currently reported in the wild. The issue is fixed in version 0.8.

MediumVulnerabilityUnited StatesGermanyUnited Kingdom+7#cve#cve-2026-32723#cwe-362

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.

CriticalVulnerabilityUnited StatesGermanyUnited Kingdom+7#cve#cve-2026-26954#cwe-94

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOwnProperty on a sandbox object, which disables prototype whitelist enforcement in the property-access path. This permits direct access to __proto__ and other blocked prototype properties, enabling host Object.prototype pollution and persistent cross-sandbox impact. This vulnerability is fixed in 0.8.29.

CriticalVulnerabilityGermanyFranceUnited Kingdom+5#cve#cve-2026-25586#cwe-74

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, The return values of functions aren't wrapped. Object.values/Object.entries can be used to get an Array containing the host's Function constructor, by using Array.prototype.at you can obtain the hosts Function constructor, which can be used to execute arbitrary code outside of the sandbox. This vulnerability is fixed in 0.8.29.

CriticalVulnerabilityGermanyFranceUnited Kingdom+5#cve#cve-2026-25520#cwe-74

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, there is a sandbox escape vulnerability due to a mismatch between the key on which the validation is performed and the key used for accessing properties. Even though the key used in property accesses is annotated as string, this is never enforced. So, attackers can pass malicious objects that coerce to different string values when used, e.g., one for the time the key is sanitized using hasOwnProperty(key) and a different one for when the key is used for the actual property access. This vulnerability is fixed in 0.8.29.

CriticalVulnerabilityGermanyFranceUnited Kingdom+3#cve#cve-2026-25641#cwe-367

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.27, SanboxJS does not properly restrict __lookupGetter__ which can be used to obtain prototypes, which can be used for escaping the sandbox / remote code execution. This vulnerability is fixed in 0.8.27.

CriticalVulnerabilityGermanyFranceUnited Kingdom+5#cve#cve-2026-25142#cwe-94