CVE-2026-23736 seroval Affected by Prototype Pollution via JSON Deserialization
Attackers can achieve prototype pollution and potential code execution via malicious JSON keys in the seroval library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23736?
CVE-2026-23736 is a high-severity unsafe deserialization vulnerability in lxsmnsyc seroval, published on 21 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, due to improper input validation, a malicious object key can lead to prototype pollution during JSON deserialization. This vulnerability affects only JSON deserialization functionality. This issue is fixed in version 1.4.1.
Weakness: CWE-1321
Which versions are affected by CVE-2026-23736?
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-2026-23736?
Upgrade seroval to 1.4.1 or later.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-23736 being exploited?
There is no known exploitation of CVE-2026-23736 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-2026-23957 seroval is vulnerable to Denial of Service via array 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
Sources
Also known as GHSA-hj76-42vx-jwp4.