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CVE-2026-23737

7.5 · HIGH

seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities.

Published Jan 21, 2026CWE-502EPSS 0.58%

Overview

CVE-2026-23737 is a high-severity vulnerability. It was published on January 21, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 1.4.0 and below, improper input handling in the JSON deserialization component can lead to arbitrary JavaScript code execution. Exploitation is possible via overriding constant value and error deserialization, allowing indirect access to unsafe JS evaluation. At minimum, attackers need 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. This issue has been fixed in version 1.4.0.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060GitHubgithub.com/lxsmnsyc/seroval/security/advisories/GHSA-3rxj-6cgf-8cfw

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23737?

CVE-2026-23737 is a high-severity vulnerability. It was published on January 21, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-23737?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-23737?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-23737?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23737 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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