CVE-2026-23737

The record

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.

Affected packages

Related vulnerabilities

• GHSA-3rxj-6cgf-8cfw seroval Affected by Remote Code Execution via JSON Deserialization Same vulnerability
• GHSA-3j22-8qj3-26mx Seroval affected by Denial of Service via Deeply Nested Objects Also affects seroval
• CVE-2026-24006 Seroval facilitates JS value stringification, including complex structures beyond… Also affects seroval
• CVE-2026-23956 seroval facilitates JS value stringification, including complex structures beyond… Also affects seroval
• CVE-2026-23957 seroval facilitates JS value stringification, including complex structures beyond… Also affects seroval
• CVE-2026-23736 seroval facilitates JS value stringification, including complex structures beyond… Also affects seroval
• GHSA-66fc-rw6m-c2q6 Seroval affected by Denial of Service via Array serialization Also affects seroval
• GHSA-hx9m-jf43-8ffr seroval affected by Denial of Service via RegExp serialization Also affects seroval