CVE-2026-59940
Seroval: `seroval.fromJSON()` Promise resolver type confusion invokes attacker-controlled methods during deserialization
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-502 CWE-843 |
| Vendor | lxsmnsyc |
| Product | seroval |
| Published | Aug 18, 2026 |
Stay Ahead of the Next One
Get instant alerts for lxsmnsyc seroval
Be the first to know when new critical vulnerabilities affecting lxsmnsyc seroval are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
lxsmnsyc / seroval
< 1.5.3