# CVE-2026-116583: Seroval typed array constructor name injection

Source: https://junglewise.ai/threats/cve-2026-116583-seroval-facilitates-javascript-value-stringification-including  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-26. Updated: 2026-10-26  
License: CC BY 4.0 with a link back

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](https://junglewise.ai/threats/technologies/lxsmnsyc-seroval), [seroval (npm)](https://junglewise.ai/threats/technologies/seroval). Vendors: [Lxsmnsyc](https://junglewise.ai/threats/vendors/lxsmnsyc), [npm](https://junglewise.ai/threats/vendors/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

  ```sh
  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

- [https://github.com/lxsmnsyc/seroval/commit/1313ebbad9687bc0245e08bfd576376e57e0e5c1](https://github.com/lxsmnsyc/seroval/commit/1313ebbad9687bc0245e08bfd576376e57e0e5c1)
- [https://github.com/lxsmnsyc/seroval/releases/tag/seroval@1.6.11](https://github.com/lxsmnsyc/seroval/releases/tag/seroval@1.6.11)

## Related threats

- [Seroval denial of service via array-like object in deserialization](https://junglewise.ai/threats/cve-2026-116584-seroval-facilitates-javascript-value-stringification-including)
- [Seroval JavaScript RegExp code injection in HTML script elements](https://junglewise.ai/threats/cve-2026-116582-seroval-facilitates-javascript-value-stringification-including)
- [Seroval improper sequence node validation in deserialization](https://junglewise.ai/threats/cve-2026-116581-seroval-facilitates-javascript-value-stringification-including)
- [Seroval incomplete fix for AsyncIterator deserialization bypass](https://junglewise.ai/threats/cve-2026-116580-seroval-facilitates-javascript-value-stringification-including)
- [Seroval Promise thenable code execution via fromJSON deserialization](https://junglewise.ai/threats/cve-2026-104846-seroval-facilitates-js-value-stringification-including-complex)