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seroval Affected by Remote Code Execution via JSON Deserialization

High severity GitHub Reviewed Published Jan 21, 2026 in lxsmnsyc/seroval • Updated Jan 22, 2026

Package

npm seroval (npm)

Affected versions

< 1.4.1

Patched versions

1.4.1

Description

Improper input handling in the JSON deserialization component can lead to arbitrary JavaScript code execution.

The vulnerability can be exploited via overriding constant value and error deserialization, which allows indirect access to unsafe JS evaluation. This requires at least the ability to perform 4 separate requests on the same function and partial knowledge of how the serialized data is used during later runtime processing.

This vulnerability affects the fromJSON and fromCrossJSON functions in a client-to-server transmission scenario.

No known workarounds or mitigations are known, so please upgrade to the patched version.

References

@lxsmnsyc lxsmnsyc published to lxsmnsyc/seroval Jan 21, 2026
Published to the GitHub Advisory Database Jan 21, 2026
Reviewed Jan 21, 2026
Published by the National Vulnerability Database Jan 21, 2026
Last updated Jan 22, 2026

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(22nd percentile)

Weaknesses

Deserialization of Untrusted Data

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. Learn more on MITRE.

CVE ID

CVE-2026-23737

GHSA ID

GHSA-3rxj-6cgf-8cfw

Source code

Credits

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