Vulnerability · Published Jan 22, 2026 · Assigned by GitHub_M

CVE-2026-23957seroval is vulnerable to Denial of Service via array serialization

High 7.5

In plain English

A high-severity resource allocation without limits in seroval from lxsmnsyc. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.4%top 61.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 1.4.0 and below, overriding encoded array lengths by replacing them with an excessively large value causes the deserialization process to significantly increase processing time. This issue has been fixed in version 1.4.1.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	seroval	1.4.1	GHSA-66fc-rw6m-c2q6

Affected products (as reported)

Vendor	Product	Versions
lxsmnsyc	seroval	< 1.4.1

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-66fc-rw6m-c2q6 x_refsource_CONFIRM
https://github.com/lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060 x_refsource_MISC