Is CVE-2026-116580 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-116580 being exploited in the wild.

How severe is CVE-2026-116580?

High severity, with a CVSS score of 7.3, published 26 October 2026.

Which products and versions are affected?

Alexis Munsayac Seroval before 1.6.8; seroval (npm) <= 1.6.7, SEMVER:introduced=0,fixed=1.6.8.

Is there a fix for CVE-2026-116580?

Yes. seroval (npm): upgrade to 1.6.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-116580 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-116580?

Check whether you run Alexis Munsayac Seroval or seroval (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-116580: Seroval incomplete fix for AsyncIterator deserialization bypass

Q: Is there a fix for CVE-2026-116580?

Yes. seroval (npm): upgrade to 1.6.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-116580 attacked?

It is attacked over the network, in a software library.

Q: Am I affected by CVE-2026-116580?

Check whether you run Alexis Munsayac Seroval or seroval (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-116580 · Severity: high · CVSS 7.3 · Published 2026-10-26

Seroval is a JavaScript serialization library that handles complex data structures. A flaw in the fromJSON deserializer allows attackers to forge stream or sequence objects with untrusted input, potentially executing arbitrary code through application plugins. This is an incomplete patch of a prior vulnerability, and the impact depends on what the application exposes.

Technologies: seroval (npm). Vendors: npm.

Quick answers

Is CVE-2026-116580 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-116580 being exploited in the wild.
How severe is CVE-2026-116580?: High severity, with a CVSS score of 7.3, published 26 October 2026.
Which products and versions are affected?: Alexis Munsayac Seroval before 1.6.8; seroval (npm) <= 1.6.7, SEMVER:introduced=0,fixed=1.6.8.
Is there a fix for CVE-2026-116580?: Yes. seroval (npm): upgrade to 1.6.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-116580 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-116580?: Check whether you run Alexis Munsayac Seroval or seroval (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

seroval (npm): upgrade to 1.6.8 or later
```
npm install seroval@1.6.8
```

Technical details

The vulnerability is an incomplete fix (CVE-2026-59940) where fromJSON rebuilds AsyncIteratorFactoryInstance by calling source.on(listener) without validating that source is a genuine internal stream. An attacker can reuse identifier slots in untrusted Seroval input to pass a malicious callable or object with an on method, triggering plugin-supplied code. The fix in 1.6.8 now uses instanceof checks and real classes instead of marker properties to prevent identity spoofing.

Affected products

Alexis Munsayac Seroval before 1.6.8

Identifiers

CVE-2026-116580
GHSA-7rv5-mrxv-xcr9

Timeline

2026-10-26: disclosed

References

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