Seroval vulnerabilities

Seroval before version 1.6.3 has a vulnerability in TypedArray deserialization that allows an attacker to provide a small JSON object with a large length value, causing excessive memory allocation and CPU or memory exhaustion.

Seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 0.2.0 through 1.4.0, overriding RegExp serialization with extremely large patterns can exhaust JavaScript runtime memory during deserialization.

Seroval from 0.12.0 until 1.6.2 has a vulnerability in fromJSON deserialization of a fulfilled Promise control node that can pass a plugin-produced callable-bearing thenable to a native Promise resolver. ECMAScript thenable assimilation then invokes the callable unexpectedly, allowing attacker-controlled JSON to trigger code in applications using plugin-capable Seroval releases. This path bypasses the Promise resolver type-confusion remediation in version 1.5.3 for CVE-2026-59940 because the unexpected invocation occurs through native Promise settlement after the referenced value is deserialized. This issue is fixed in version 1.6.2.

Seroval prior to 1.5.3 allows attacker-controlled JSON deserialization that can lead to unintended side effects, and when combined with frameworks registering callable wrappers, potentially unintended server-side invocation or remote code execution.