---
id: CVE-2026-104846
title: >-
  Seroval facilitates JS value stringification, including complex structures
  beyond JSON.stringify capabilities
summary: >-
  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-bear…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-843
vendor: lxsmnsyc
product: seroval
affected:
  - 'seroval >= 0.12.0, < 1.6.2'
published: '2026-10-02'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T16:16:47.363'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-104846'
references:
  - url: >-
      https://github.com/lxsmnsyc/seroval/commit/f1ffcc96d259f9b5b3d71feb262b58240c90e7b7
    label: security-advisories@github.com
  - url: >-
      https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-p6vx-979v-rg4c
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-02T16:22:59.527Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.