CVE-2026-34043
Medium
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.
SeverityMedium
CVSS5.9
Exploit probability—
Product
Yahoo Serialize
PublishedMar 31, 2026
First seenMar 31, 2026
How to fix
Update
- yahoo serialize7.0.5 or later
- serialize-javascript7.0.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| yahoo serialize | v < 7.0.5 | 7.0.5 |
| serialize-javascriptnpm | 5.0.0 ≤ v < 7.0.5 | 7.0.5 |
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