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CVE-2026-23736

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Date: January 21, 2026

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.

Severity Score

Related Resources (5)

https://github.com/lxsmnsyc/seroval
https://nvd.nist.gov/vuln/detail/CVE-2026-23736
https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-hj76-42vx-jwp4
https://github.com/lxsmnsyc/seroval/commit/ce9408ebc87312fcad345a73c172212f2a798060
https://www.mend.io/vulnerability-database/CVE-2026-23736

Severity Score

Weakness Type (CWE)

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

CWE-1321

Top Fix

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Upgrade Version

Upgrade to version seroval - 1.4.1

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): LOW

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