Deserialization Vulnerability in Seroval Affects Various JavaScript Applications
CVE-2026-59940

9.8CRITICAL

Key Information:

Vendor

Lxsmnsyc

Status
Seroval
Vendor
CVE Published:
18 August 2026

What is CVE-2026-59940?

The deserialization vulnerability in Seroval before version 1.5.3 allows attacker-controlled JSON Promise control nodes to manipulate values from the general deserialization reference table without proper verification of internal Promise resolver records. This could lead to unwanted server-side effects or even remote code execution, especially when downstream frameworks register callable wrappers. It is essential for users to upgrade to version 1.5.3 or later to mitigate this risk.

Affected Version(s)

seroval < 1.5.3

References

https://github.com/lxsmnsyc/seroval/security/advisories/G...
x_refsource_CONFIRM

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.