Prototype Pollution in seroval JSON Deserialization Prior to

Publication date: 2026-01-21

Last updated on: 2026-02-27

Assigner: GitHub, Inc.

Description

seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 1.4.0 and below, due to improper input validation, a malicious object key can lead to prototype pollution during JSON deserialization. This vulnerability affects only JSON deserialization functionality. This issue is fixed in version 1.4.1.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-01-21

Last Modified

2026-02-27

Generated

2026-07-06

AI Q&A

2026-01-22

EPSS Evaluated

2026-07-05

NVD

CVE-2026-23736

Affected Vendors & Products

Vendor	Product	Version / Range
lxsmnsyc	seroval	to 1.4.1 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-1321	The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.

Attack-Flow Graph

Executive Summary

This vulnerability exists in seroval versions 1.4.0 and below, where improper input validation allows a malicious object key to cause prototype pollution during JSON deserialization. Prototype pollution can alter the behavior of JavaScript objects by modifying their prototype chain, potentially leading to unexpected behavior or security issues. The vulnerability affects only the JSON deserialization functionality and is fixed in version 1.4.1.

Impact Analysis

The vulnerability can lead to prototype pollution, which may allow an attacker to manipulate the behavior of JavaScript objects during JSON deserialization. This can result in data corruption, unauthorized access, or other security impacts such as confidentiality, integrity, and availability loss, as indicated by the CVSS score.

Mitigation Strategies

Upgrade seroval to version 1.4.1 or later, as this version contains the fix for the prototype pollution vulnerability during JSON deserialization.

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