# Seroval: Code injection through a typed array's own constructor property

Advisory record · `GHSA-f86p-h4j2-7qgj`

- **Identifiers:** `GHSA-f86p-h4j2-7qgj` · `CVE-2026-116583`
- **State:** Confirmed
- **Severity:** CVSS 5.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-79](https://cwe.mitre.org/data/definitions/79.html) · [CWE-94](https://cwe.mitre.org/data/definitions/94.html)
- **Tags:** [Cross-site scripting (XSS)](https://agentprime.io/advisories/tag/xss.md) · [Code injection](https://agentprime.io/advisories/tag/code-injection.md)
- **Published:** 28 Oct 2026
- **Updated:** 28 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 28 Oct 2026, 21:17 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `seroval` (npm): affected `>=1.6.0, <1.6.11`; fixed in `1.6.11`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 5.3 Medium, CVSS 4.0: `CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0027, the 19th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 13:32 UTC: First seen by agentprime
- 31 Oct 2026, 13:32 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-f86p-h4j2-7qgj)

## Sources

- [GitHub Advisory Database: GHSA-f86p-h4j2-7qgj](https://github.com/advisories/GHSA-f86p-h4j2-7qgj)
- [OSV: GHSA-f86p-h4j2-7qgj](https://osv.dev/vulnerability/GHSA-f86p-h4j2-7qgj)
- <https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-f86p-h4j2-7qgj>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-116583>
- <https://github.com/lxsmnsyc/seroval/commit/1313ebbad9687bc0245e08bfd576376e57e0e5c1>
- <https://github.com/lxsmnsyc/seroval>
- <https://github.com/lxsmnsyc/seroval/releases/tag/seroval@1.6.11>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-f86p-h4j2-7qgj>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-f86p-h4j2-7qgj/>. Everything for agents: <https://agentprime.io/llms.txt>.