CVE-2026-34043
Serialize JavaScript has CPU Exhaustion Denial of Service via crafted array-like objects
5.9
MEDIUM
CVSS 3.1
EPSS 0.02%
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.
How to fix CVE-2026-34043
To remediate CVE-2026-34043, upgrade the affected package to a fixed version below.
- —no fix listed
- —upgrade to 7.0.5 or later
Is CVE-2026-34043 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0
- >= 5.0.0, < 7.0.5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |