Vulnerability · Published Oct 26, 2026 · Assigned by GitHub_M

CVE-2026-116584Seroval `fromJSON`/`fromCrossJSON` denial of service via unvalidated array node length

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 30% 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 69.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Seroval facilitates JavaScript value stringification, including complex structures beyond JSON.stringify capabilities. From 1.4.1 until 1.6.8, fromJSON and fromCrossJSON do not require an array node's element list to be an actual array. A small crafted payload can supply an attacker-controlled length that determines memory allocation and decoder iterations independently of payload size, allowing an unauthenticated request to exhaust the process or block its thread. This issue is a residual bypass of the remediation for CVE-2026-23957. This issue is fixed in version 1.6.8.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	seroval	1.6.8	GHSA-wp97-x4hv-qvhp

Affected products (as reported)

Vendor	Product	Versions
lxsmnsyc	seroval	>= 1.4.1, < 1.6.8

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-wp97-x4hv-qvhp x_refsource_CONFIRM
https://github.com/lxsmnsyc/seroval/commit/cdcee3e3bc384ee844360844f8ea98fd2b275d69 x_refsource_MISC
https://github.com/lxsmnsyc/seroval/releases/tag/seroval@1.6.8 x_refsource_MISC