seroval Affected by Prototype Pollution via JSON Deserialization

CRITICAL 9.8CVE-2026-23736 · GHSA-hj76-42vx-jwp4 · Published 21/01/2026 · updated 17/06/2026

Package	Affected versions	Patched versions
seroval lxsmnsyc	`< 1.4.1`	`1.4.1`
seroval npm	`< 1.4.1`	`1.4.1`

Description

Due to improper input validation, a malicious object key can lead to prototype pollution during JSON deserialization. This affects only JSON deserialization functionality.

As there is no known workaround, please upgrade to the latest version.

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.

References

lxsmnsyc/seroval security advisory · WEB
nvd.nist.gov/vuln/detail/CVE-2026-23736 · ADVISORY
lxsmnsyc/seroval commit ce9408e · WEB
lxsmnsyc/seroval · PACKAGE

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