Is CVE-2026-116583 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-116583 being exploited in the wild.

How severe is CVE-2026-116583?

Medium severity, with a CVSS score of 4, published 26 October 2026.

Which products and versions are affected?

Lxsmnsyc Seroval 1.6.0 to 1.6.10; seroval (npm) >= 1.6.0, < 1.6.11, SEMVER:introduced=1.6.0,fixed=1.6.11.

Is there a fix for CVE-2026-116583?

Yes. seroval (npm): upgrade to 1.6.11 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-116583 attacked?

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

Am I affected by CVE-2026-116583?

Check whether you run Lxsmnsyc 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-2026-116583: Seroval typed array constructor name injection

Q: Is there a fix for CVE-2026-116583?

Yes. seroval (npm): upgrade to 1.6.11 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-116583 attacked?

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

Q: Am I affected by CVE-2026-116583?

Check whether you run Lxsmnsyc 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-2026-116583 · Severity: medium · CVSS 4 · Published 2026-10-26

Seroval is a JavaScript library that serializes complex data structures to executable code. An attacker who can inject untrusted properties onto a typed array can embed arbitrary JavaScript code in the serialized output, which executes when the output is received and evaluated by another application or page.

Technologies: Lxsmnsyc Seroval, seroval (npm). Vendors: Lxsmnsyc, npm.

Quick answers

Is CVE-2026-116583 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-116583 being exploited in the wild.
How severe is CVE-2026-116583?: Medium severity, with a CVSS score of 4, published 26 October 2026.
Which products and versions are affected?: Lxsmnsyc Seroval 1.6.0 to 1.6.10; seroval (npm) >= 1.6.0, < 1.6.11, SEMVER:introduced=1.6.0,fixed=1.6.11.
Is there a fix for CVE-2026-116583?: Yes. seroval (npm): upgrade to 1.6.11 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-116583 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-116583?: Check whether you run Lxsmnsyc 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 1.6.11 or later
```
npm install seroval@1.6.11
```

Technical details

The vulnerability is a code injection flaw in Seroval's typed array serialization. When serializing typed arrays, the library reads the constructor name from value.constructor.name, which can be replaced by an attacker-supplied own property. This attacker-controlled name is written directly into the output JavaScript code after the `new` keyword, allowing arbitrary code injection. The flaw affects serialize, serializeAsync, crossSerialize, crossSerializeAsync, crossSerializeStream, and the Serializer and compileJSON APIs.

Affected products

lxsmnsyc Seroval 1.6.0 to 1.6.10

Identifiers

CVE-2026-116583
GHSA-f86p-h4j2-7qgj

Timeline

2026-10-26: disclosed
2026-10-18: patched

References

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