CVE WatchOct 5, 2026

CVE-2026-104846

Seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. From 0.12.0 until 1.6.2, from

CVSS

9.8

Critical

EPSS

0.3%

p27

KEV

—

Exploit Today

0-100

Published: Oct 2, 2026 · Last modified: Oct 5, 2026 · CWE-843

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-10-032026-10-21

Technical 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.

Official references

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