Vulnerability · Published Jan 21, 2026 · Assigned by GitHub_M

CVE-2026-23736seroval Affected by Prototype Pollution via JSON Deserialization

High 7.3

In plain English

A high-severity prototype pollution 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 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.3High

Exploit odds (30 days)0.3%top 76.9% 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, due to improper input validation, a malicious object key can lead to prototype pollution during JSON deserialization. This vulnerability affects only JSON deserialization functionality. This issue is fixed in version 1.4.1.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	seroval	1.4.1	GHSA-hj76-42vx-jwp4

Affected products (as reported)

Vendor	Product	Versions
lxsmnsyc	seroval	< 1.4.1

Weakness: CWE-1321 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References

https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-hj76-42vx-jwp4 x_refsource_CONFIRM
https://github.com/lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060 x_refsource_MISC