Resource exhaustion in Yahoo Serialize
CVE-2026-34043
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.
Vulnerability class: DoS (Denial of Service)
EPSS: 0.005 (38.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Yahoo Serialize
- Yahoo Serialize-javascript — versions < 7.0.5
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-34043?
- CVE-2026-34043 is a medium-severity vulnerability in Yahoo Serialize, classified under Uncontrolled Resource Consumption. CVSS score: 5.9/10. Published 2026-03-31.
- How severe is CVE-2026-34043?
- Medium severity. CVSS v3 base score is 5.9 out of 10.