# Seroval \`fromJSON\`/\`fromCrossJSON\` denial of service via unvalidated array node length

Advisory record · `GHSA-wp97-x4hv-qvhp`

- **Identifiers:** `GHSA-wp97-x4hv-qvhp` · `CVE-2026-116584`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Weakness (CWE):** [CWE-770](https://cwe.mitre.org/data/definitions/770.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.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 `>=1.4.1, <1.6.8`; fixed in `1.6.8`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Seroval versions >=1.4.1 and <1.6.8 are affected. In \`fromJSON\` and \`fromCrossJSON\`, an array node's length was not checked, so a small crafted payload could control how much memory the decoder allocated and how long it looped. An unauthenticated attacker who can send input to a service that passes it to these functions can exhaust memory or block the thread, making the service unavailable. Upgrade to seroval 1.6.8, which rejects malformed array nodes; the source lists no workaround.

Written 31 Oct 2026.

## 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

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0037, the 30th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 26 Oct 2026, 20:52 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-116584)
- 26 Oct 2026, 21:18 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-116584)
- 31 Oct 2026, 13:32 UTC: First seen by agentprime
- 31 Oct 2026, 13:32 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-wp97-x4hv-qvhp)

## Sources

- [GitHub Advisory Database: GHSA-wp97-x4hv-qvhp](https://github.com/advisories/GHSA-wp97-x4hv-qvhp)
- [OSV: GHSA-wp97-x4hv-qvhp](https://osv.dev/vulnerability/GHSA-wp97-x4hv-qvhp)
- <https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-wp97-x4hv-qvhp>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-116584>
- <https://github.com/lxsmnsyc/seroval/commit/cdcee3e3bc384ee844360844f8ea98fd2b275d69>
- <https://github.com/lxsmnsyc/seroval>
- <https://github.com/lxsmnsyc/seroval/releases/tag/seroval@1.6.8>

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-wp97-x4hv-qvhp>, 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-wp97-x4hv-qvhp/>. Everything for agents: <https://agentprime.io/llms.txt>.