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Vulnerability record · CVE-2026-23736 · published 21 January 2026

CVE-2026-23736: Lxsmnsyc seroval prototype pollution vulnerability

LLxsmnsyc · Seroval

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.

9.8 CVSS 3.1 Critical EPSS 0.29% · top 80.4% CWE-1321 · Prototype pollution
9.8CVSS 3.1 base score
0.29%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060 Patch
https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-hj76-42vx-jwp4 Vendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-23736), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.