Threats Tagged 'cve-2026-59940'

CVE-2026-23736 is a high-severity prototype pollution vulnerability in the seroval JavaScript value stringification library (versions below 1.4.1). The flaw arises from improper input validation during JSON deserialization, allowing attackers to modify object prototype attributes maliciously. Exploitation requires no authentication or user interaction and can be performed remotely over the network. Successful attacks can lead to partial compromise of confidentiality, integrity, and availability of affected applications. The vulnerability is fixed in seroval version 1.4.1. European organizations using vulnerable versions in their JavaScript environments should prioritize updating to mitigate risks.

HighVulnerabilityGermanyFranceNetherlands+5#cve#cve-2026-23736#cwe-1321

Seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. Prior to 1.5.3, seroval.fromJSON() allows attacker-controlled JSON Promise control nodes to operate on values from the general deserialization reference table without verifying genuine internal Promise resolver records, causing deserialization side effects with plugins enabled and potentially unintended server-side invocation or remote code execution when downstream frameworks register callable wrappers. This issue is fixed in version 1.5.3.