# CVE-2026-116584: Seroval `fromJSON`/`fromCrossJSON` denial of service via unvalidated array node length

Status: published. Published: 2026-10-26. Updated: 2026-11-02.

Seroval facilitates JavaScript value stringification, including complex structures beyond JSON.stringify capabilities. From 1.4.1 until 1.6.8, fromJSON and fromCrossJSON do not require an array node's element list to be an actual array. A small crafted payload can supply an attacker-controlled length that determines memory allocation and decoder iterations independently of payload size, allowing an unauthenticated request to exhaust the process or block its thread. This issue is a residual bypass of the remediation for CVE-2026-23957. This issue is fixed in version 1.6.8.

## Remediation

- fix: seroval (npm): OSV reports a fixed version 1.6.8. Check the advisory for supported release branches. (source: OSV GHSA-wp97-x4hv-qvhp) — https://github.com/advisories/GHSA-wp97-x4hv-qvhp

## Affected products and versions

- lxsmnsyc / seroval: >= 1.4.1, < 1.6.8 (affected). Source: CNA: GitHub_M
-  / seroval (seroval): ≥ 1.4.1; < 1.6.8 (affected, semver); OSV events: introduced 1.4.1; fixed 1.6.8. Source: OSV GHSA-wp97-x4hv-qvhp

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: 0.36% as of 2026-11-02; percentile 30.30%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-770

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-wp97-x4hv-qvhp (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/lxsmnsyc/seroval/commit/cdcee3e3bc384ee844360844f8ea98fd2b275d69 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/lxsmnsyc/seroval/releases/tag/seroval@1.6.8 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/advisories/GHSA-wp97-x4hv-qvhp (OSV / GitHub Security Advisories; advisory)

- https://osv.dev/vulnerability/GHSA-wp97-x4hv-qvhp (OSV / GitHub Security Advisories; osv)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-116584; retrieved 2026-11-02; source updated 2026-11-02

- OSV / GitHub Security Advisories: https://osv.dev/vulnerability/GHSA-wp97-x4hv-qvhp; retrieved 2026-11-02; source updated 2026-10-28

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-116584; retrieved 2026-11-02; source updated Not reported

Revision: 26fadf367b708a9985ae22bc4efb14b5817059aa1652deb49c43423182faef67

Canonical: https://y2.dev/cve/CVE-2026-116584

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