# CVE-2026-34043: Serialize JavaScript has CPU Exhaustion Denial of Service via crafted array-like objects

> CVE-2026-34043: Serialize JavaScript has CPU Exhaustion Denial of Service via crafted array-like objects. CVSS 5.9 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-34043
Last updated: 2026-06-17T10:38:28Z

- Published: 2026-03-31 01:48 UTC · Updated: 2026-06-17 10:38 UTC · Assigner: GitHub\_M
- CVSS: 5.9 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS: 0.47%, 41th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-400, CWE-834

## Description

Serialize JavaScript to a superset of JSON that includes regular expressions and functions. Prior to version 7.0.5, there is a Denial of Service (DoS) vulnerability caused by CPU exhaustion. When serializing a specially crafted "array-like" object (an object that inherits from Array.prototype but has a very large length property), the process enters an intensive loop that consumes 100% CPU and hangs indefinitely. This issue has been patched in version 7.0.5.

## Affected vendors and products

- yahoo: serialize-javascript

## Tracked companies

- [Confluence](https://rewindex.com/company/confluence.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-34043)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-34043)
- [https://github.com/yahoo/serialize-javascript/commit/f147e90269b58bb6e539cfdf3d0e20d6ad14204b](https://github.com/yahoo/serialize-javascript/commit/f147e90269b58bb6e539cfdf3d0e20d6ad14204b)
- [https://github.com/yahoo/serialize-javascript/releases/tag/v7.0.5](https://github.com/yahoo/serialize-javascript/releases/tag/v7.0.5)
- [https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-qj8w-gfj5-8c6v](https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-qj8w-gfj5-8c6v)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-34043 · Markdown: https://rewindex.com/cve/CVE-2026-34043.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-34043 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:10:51.709Z