What is CVE-2026-116580?

CVE-2026-116580 is a high-severity vulnerability in Lxsmnsyc Seroval, classified under Deserialization of Untrusted Data. CVSS score: 7.3/10. Published 2026-10-26.

How severe is CVE-2026-116580?

High severity. CVSS v3 base score is 7.3 out of 10.

Deserialization in Lxsmnsyc Seroval

CVE-2026-116580

Seroval facilitates JavaScript value stringification, including complex structures beyond JSON.stringify capabilities. Prior to 1.6.8, fromJSON rebuilds an AsyncIteratorFactoryInstance by calling source.on(listener) without requiring source to be a genuine internal stream. With untrusted Seroval input and an application plugin that returns a callable value or an object exposing an on method, a crafted node can reuse an identifier so the deserializer invokes the plugin-produced value. This is an incomplete-fix variant of CVE-2026-59940. The resulting confidentiality, integrity, or availability impact depends on the behavior exposed by the application plugin. This issue is fixed in version 1.6.8.

Vulnerability class: Insecure Deserialization

Published 2026-10-26 · last modified 2026-10-26.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Lxsmnsyc Seroval — versions < 1.6.8

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

Frequently asked questions

What is CVE-2026-116580?: CVE-2026-116580 is a high-severity vulnerability in Lxsmnsyc Seroval, classified under Deserialization of Untrusted Data. CVSS score: 7.3/10. Published 2026-10-26.
How severe is CVE-2026-116580?: High severity. CVSS v3 base score is 7.3 out of 10.