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CVE-2026-104846— Seroval: `fromJSON()` Promise thenable assimilation invokes plugin-produced callables (bypass of CVE-2026-59940)

Quick assessment

Affected
lxsmnsyc seroval
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Seroval 支持 JavaScript 值的字符串化，包括超出 JSON.stringify 能力的复杂结构。从版本 0.12.0 到 1.6.2， 在反序列化一个已解决的 Promise 控制节点时，可能将一个由插件生成的、包含可调用对象的 thenable 传递给原生的 Promise 解析器。根据 ECMAScript 规范，thenable 的合并机制会意外调用该可调用对象，从而使攻击者可控的 JSON 数据能够触发使用支持插件功能的 Seroval 版本的应用程序中的代码执行。此路径绕过了版本 1.5

CVSS 9.8 · Critical

Affected Version Matrix 1

VendorProduct Version RangeStatus
lxsmnsyc seroval >= 0.12.0, < 1.6.2 affected
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I. Basic Information for CVE-2026-104846

Vulnerability Information
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Vulnerability Title
Seroval: `fromJSON()` Promise thenable assimilation invokes plugin-produced callables (bypass of CVE-2026-59940)
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用不兼容类型访问资源(类型混淆)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
lxsmnsyc seroval >= 0.12.0, < 1.6.2 -

II. Public POCs for CVE-2026-104846

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III. Intelligence Information for CVE-2026-104846

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Patches & Fixes for CVE-2026-104846 (1)

Vendor Advisories for CVE-2026-104846 (1)

IV. Related Vulnerabilities

Same product: seroval
Same vendor: lxsmnsyc
Same weakness: CWE-843

V. Comments for CVE-2026-104846

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