Deserialization of Untrusted Data Affecting seroval package, versions <1.4.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-SEROVAL-15054506
- published23 Jan 2026
- disclosed21 Jan 2026
- creditGabriel Valfridsson
Introduced: 21 Jan 2026
NewCVE-2026-23737 (opens in a new tab)How to fix?
Upgrade seroval to version 1.4.2 or higher.
Overview
seroval is a Stringify JS values
Affected versions of this package are vulnerable to Deserialization of Untrusted Data in the fromJSON and fromCrossJSON functions during JSON deserialization. An attacker can execute arbitrary JavaScript code by crafting serialized data that exploits improper input handling and error deserialization, potentially overriding constant values and gaining indirect access to unsafe evaluation.
Note: This is only exploitable if the attacker has partial knowledge of how the serialized data is processed during runtime.
Details
Serialization is a process of converting an object into a sequence of bytes which can be persisted to a disk or database or can be sent through streams. The reverse process of creating object from sequence of bytes is called deserialization. Serialization is commonly used for communication (sharing objects between multiple hosts) and persistence (store the object state in a file or a database). It is an integral part of popular protocols like Remote Method Invocation (RMI), Java Management Extension (JMX), Java Messaging System (JMS), Action Message Format (AMF), Java Server Faces (JSF) ViewState, etc.
Deserialization of untrusted data (CWE-502) is when the application deserializes untrusted data without sufficiently verifying that the resulting data will be valid, thus allowing the attacker to control the state or the flow of the execution.