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CVE-2026-104846

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 9.8 · Critical · EPSS 0.3% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • seroval

    Versions
    • >= 0.12.0, < 1.6.2: Affected

    No fix published

  • seroval npm

    Affected ranges
    • SEMVER: ≥ 0.12.0, < 1.6.2

    Update to 1.6.2

Original sources

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