Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Lxsmnsyc | Seroval | < 1.4.1 |
Related Weaknesses (CWE)
References
- https://github.com/lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798Patch
- https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-3rxj-6cgf-8cfwVendor Advisory
FAQ
What is CVE-2026-23737?
CVE-2026-23737 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 componen...
How severe is CVE-2026-23737?
CVE-2026-23737 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-23737?
Check the references section above for vendor advisories and patch information. Affected products include: Lxsmnsyc Seroval.