CVE-2026-23957 seroval is vulnerable to Denial of Service via array serialization
Attackers can cause denial of service in seroval by manipulating array lengths during deserialization, leading to excessive processing time.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23957?
CVE-2026-23957 is a high-severity denial of service vulnerability in lxsmnsyc seroval, published on 22 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 1.4.0 and below, overriding encoded array lengths by replacing them with an excessively large value causes the deserialization process to significantly increase processing time. This issue has been fixed in version 1.4.1.
Weakness: CWE-770
Which versions are affected by CVE-2026-23957?
2 open source packages ship an affected version, including seroval. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
seroval npm | All versions | 1.4.1 |
seroval npm | All versions | 1.4.1 |
Products include Lxsmnsyc Seroval.
How do I fix CVE-2026-23957?
Upgrade seroval to 1.4.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-23957 being exploited?
There is no known exploitation of CVE-2026-23957 in the wild and no public exploit code.
Other vulnerabilities in lxsmnsyc seroval
- CVE-2026-23956 seroval affected by Denial of Service via RegExp serialization
- CVE-2026-24006 Seroval affected by Denial of Service via Deeply Nested Objects
- CVE-2026-23737 seroval Affected by Remote Code Execution via JSON Deserialization
- CVE-2026-23736 seroval Affected by Prototype Pollution via JSON Deserialization
Sources
Also known as GHSA-66fc-rw6m-c2q6.