# CVE-2026-116580: Seroval: Deserialization invokes attacker-chosen callables: AsyncIteratorFactoryInstance calls source.on(listener) without type check

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

Seroval facilitates JavaScript value stringification, including complex structures beyond JSON.stringify capabilities. Prior to 1.6.8, fromJSON rebuilds an AsyncIteratorFactoryInstance by calling source.on(listener) without requiring source to be a genuine internal stream. With untrusted Seroval input and an application plugin that returns a callable value or an object exposing an on method, a crafted node can reuse an identifier so the deserializer invokes the plugin-produced value. This is an incomplete-fix variant of CVE-2026-59940. The resulting confidentiality, integrity, or availability impact depends on the behavior exposed by the application plugin. 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-7rv5-mrxv-xcr9) — https://github.com/advisories/GHSA-7rv5-mrxv-xcr9

## Affected products and versions

- lxsmnsyc / seroval: < 1.6.8 (affected). Source: CNA: GitHub_M
-  / seroval (seroval): ≥ 0; < 1.6.8 (affected, semver); OSV events: introduced 0; fixed 1.6.8. Source: OSV GHSA-7rv5-mrxv-xcr9

## Severity and prioritization

- CVSS 3.1: 7.3 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: 0.34% as of 2026-11-02; percentile 27.70%

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

- Weaknesses: CWE-502

## Exploit evidence

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

## References

- https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-7rv5-mrxv-xcr9 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/lxsmnsyc/seroval/commit/3edc78b495ea0d6bd498143e5b3e56996607c5f2 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/lxsmnsyc/seroval/commit/50926b3ee198fb757e6ce3aa70efeed38d931c8d (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-7rv5-mrxv-xcr9 (OSV / GitHub Security Advisories; advisory)

- https://osv.dev/vulnerability/GHSA-7rv5-mrxv-xcr9 (OSV / GitHub Security Advisories; osv)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-116580; retrieved 2026-11-02; source updated 2026-11-02

- OSV / GitHub Security Advisories: https://osv.dev/vulnerability/GHSA-7rv5-mrxv-xcr9; retrieved 2026-11-02; source updated 2026-10-28

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-116580; retrieved 2026-11-02; source updated Not reported

Revision: 8a1e57aba25600b3ca5fe6caebe35fefb7707e4a50091fd1c47eefe850aa7530

Canonical: https://y2.dev/cve/CVE-2026-116580

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.