CVE-2026-59940
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk48th percentile - higher than 48% of all known CVEs
Summary
Seroval prior to 1.5.3 allows attacker-controlled JSON deserialization that can lead to unintended side effects, and when combined with frameworks registering callable wrappers, potentially unintended server-side invocation or remote code execution.
Risk Assessment
Potential remote code execution on the server if the application uses seroval with plugins enabled and registers callable wrappers.
Recommendation
Update seroval to version 1.5.3 or later.
Other vulnerabilities in Seroval
See all- CVE-2026-104845High
Seroval before version 1.6.3 has a vulnerability in TypedArray deserialization that allows an attacker to provide a small JSON object with a large length value, causing excessive memory allocation and CPU or memory exhaustion.
- CVE-2026-23956High
Seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 0.2.0 through 1.4.0, overriding RegExp serialization with extremely large patterns can exhaust JavaScript runtime memory during deserialization.
- CVE-2026-104846Critical
Seroval from 0.12.0 until 1.6.2 has a vulnerability in fromJSON deserialization of a fulfilled Promise control node that 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.
Original NVD description (English source)
Seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. Prior to 1.5.3, seroval.fromJSON() allows attacker-controlled JSON Promise control nodes to operate on values from the general deserialization reference table without verifying genuine internal Promise resolver records, causing deserialization side effects with plugins enabled and potentially unintended server-side invocation or remote code execution when downstream frameworks register callable wrappers. This issue is fixed in version 1.5.3.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS