CVE-2026-104846

9.8 CRITICALpublic exploit available

Published 2026-10-02 · Updated 2026-10-05

AI risk analysis

Summary: This flaw allows attacker-controlled JSON to execute arbitrary code by deserializing a fulfilled Promise control node, which invokes a callable unexpectedly.
Exploitability: Exploitation is moderately hard as it requires the deserialization of a specific type of JSON payload, and the target application must be using a vulnerable version of Seroval.
Blast radius: If exploited, this could lead to full code execution in the context of the application, potentially compromising the entire system.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to Seroval version 1.6.2 or later.

rcejson-deserializationpromiseweb

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-843

Public exploit & PoC references

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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