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Vulnerability record · CVE-2026-34043 · published 31 March 2026

CVE-2026-34043: Yahoo serialize uncontrolled resource consumption vulnerability

Yahoo · Serialize

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.

7.5 CVSS 3.1 High EPSS 0.58% · top 54.5% CWE-400 · Uncontrolled resource consumptionCWE-834 · CWE-834
7.5CVSS 3.1 base score
0.58%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/yahoo/serialize-javascript/commit/f147e90269b58bb6e539cfdf3d0e20d6ad14204b Patch
https://github.com/yahoo/serialize-javascript/releases/tag/v7.0.5 Release Notes
https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-qj8w-gfj5-8c6v Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-34043), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.