lxsmnsyc Seroval up to 1.6.1 fromJSON deserialization

Summaryinfo

A vulnerability has been found in lxsmnsyc Seroval up to 1.6.1 and classified as critical. This vulnerability affects the function fromJSON. This manipulation causes deserialization. This vulnerability is registered as CVE-2026-104846. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in lxsmnsyc Seroval up to 1.6.1 and classified as critical. Affected by this vulnerability is the function fromJSON. The manipulation with an unknown input leads to a deserialization vulnerability. The CWE definition for the vulnerability is CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. From 0.12.0 until 1.6.2, fromJSON deserialization of a fulfilled Promise control node can pass a plugin-produced callable-bearing thenable to a native Promise resolver. ECMAScript thenable assimilation then invokes the callable unexpectedly, allowing attacker-controlled JSON to trigger code in applications using plugin-capable Seroval releases. This path bypasses the Promise resolver type-confusion remediation in version 1.5.3 for CVE-2026-59940 because the unexpected invocation occurs through native Promise settlement after the referenced value is deserialized. This issue is fixed in version 1.6.2.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-104846 since 10/02/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

Upgrading to version 1.6.2 eliminates this vulnerability.

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Productinfo

Vendor

• lxsmnsyc

Name

• Seroval

Version

• 1.6.0
• 1.6.1

Website

• Product: https://github.com/lxsmnsyc/seroval/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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