How broadly exploitable is this vulnerability?

Exploitability depends on whether an attacker can control Seroval-encoded payloads that are later deserialized with `fromJSON` or `fromCrossJSON` and then processed in a way that reaches the unsafe evaluation paths. The requirement for multiple coordinated requests and some insight into application behavior raises the bar, but in many client–server scenarios that still lies within a realistic attacker capability.

What level of access does an attacker need?

An attacker generally needs the ability to send at least four crafted requests to the same logical function or endpoint that uses Seroval for serialization and deserialization. They must also have partial knowledge of how the application consumes the reconstructed values, which can often be inferred from observed behavior, API contracts, or documentation.

What is the safest general fix pattern?

The safest pattern is to treat Seroval data as untrusted and limit deserialization to benign, data-only structures. Avoid reconstructing complex objects, constants, or error types from untrusted sources, and refactor code so that cross-boundary communication uses simple JSON or similarly constrained formats where possible.

Severity:

HIGH RISK

(7.5)

Unsafe JSON Deserialization (CWE-502) in Seroval fromJSON/fromCrossJSON

CVE-2026-23737

Published:

Jan 21, 2026

Status:

Awaiting Analysis

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-306

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

Account Takeover / Loss of Account Control

February 17, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

Unsafe Deserialization

CWE:

CWE-502

Impact:

Remote Code Execution

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Unsafe Deserialization

CWE:

CWE-502

Impact:

Remote Code Execution

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

Detect vulnerable code directly in pull requests, so CVEs are fixed before merge.

Get Started

Ship clean & secure code faster

START 14 DAYS FREE TRIAL

BOOK A DEMO

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Unsafe JSON Deserialization (CWE-502) in Seroval fromJSON/fromCrossJSON

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Product

Pricing

Company

Legal

Developers

Compare

Product

Pricing

Company

Legal

Developers

Compare

Product

Pricing

Company

Legal

Developers

Compare