CVE-2026-116580 Seroval: Deserialization invokes attacker-chosen callables: AsyncIteratorFactoryInstance calls source.on(listener) without type check
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-116580?
CVE-2026-116580 is a high-severity vulnerability in lxsmnsyc seroval, published on 26 Oct 2026.
Official description
Seroval facilitates JavaScript value stringification, including complex structures beyond JSON.stringify capabilities. Prior to 1.6.8, fromJSON rebuilds an AsyncIteratorFactoryInstance by calling source.on(listener) without requiring source to be a genuine internal stream. With untrusted Seroval input and an application plugin that returns a callable value or an object exposing an on method, a crafted node can reuse an identifier so the deserializer invokes the plugin-produced value. This is an incomplete-fix variant of CVE-2026-59940. The resulting confidentiality, integrity, or availability impact depends on the behavior exposed by the application plugin. This issue is fixed in version 1.6.8.
Weakness: CWE-502
Which versions are affected by CVE-2026-116580?
2 open source packages ship an affected version, including seroval.
| Package | Affected | Fixed in |
|---|---|---|
seroval npm | All versions | 1.6.8 |
seroval npm | All versions | 1.6.8 |
How do I fix CVE-2026-116580?
Upgrade seroval to 1.6.8 or later.
Is CVE-2026-116580 being exploited?
There is no known exploitation of CVE-2026-116580 in the wild and no public exploit code.
Sources
Also known as GHSA-7rv5-mrxv-xcr9.