GHSA-qj8w-gfj5-8c6v

Source

https://github.com/advisories/GHSA-qj8w-gfj5-8c6v

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-qj8w-gfj5-8c6v/GHSA-qj8w-gfj5-8c6v.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-qj8w-gfj5-8c6v

Aliases

CVE-2026-34043

Published

2026-03-27T18:18:54Z

Modified

2026-03-27T18:31:25.208557Z

Severity

5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator

Summary

Serialize JavaScript has CPU Exhaustion Denial of Service via crafted array-like objects

Details

Impact

What kind of vulnerability is it?

It 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.

Who is impacted?

Applications that use serialize-javascript to serialize untrusted or user-controlled objects are at risk. While direct exploitation is difficult, it becomes a high-priority threat if the application is also vulnerable to Prototype Pollution or handles untrusted data via YAML Deserialization, as these could be used to inject the malicious object.

Patches

Has the problem been patched?

Yes, the issue has been patched by replacing instanceof Array checks with Array.isArray() and using Object.keys() for sparse array detection.

What versions should users upgrade to?

Users should upgrade to v7.0.5 or later.

Workarounds

Is there a way for users to fix or remediate the vulnerability without upgrading?

There is no direct code-level workaround within the library itself. However, users can mitigate the risk by:

Validating and sanitizing all input before passing it to the serialize() function.
Ensuring the environment is protected against Prototype Pollution.
Upgrading to v7.0.5 as soon as possible.

Acknowledgements

Serialize JavaScript thanks Tomer Aberbach (@TomerAberbach) for discovering and privately disclosing this issue.

Database specific

{
    "github_reviewed": true,
    "cwe_ids": [
        "CWE-400",
        "CWE-834"
    ],
    "nvd_published_at": null,
    "github_reviewed_at": "2026-03-27T18:18:54Z",
    "severity": "MODERATE"
}

References

Affected packages

npm / serialize-javascript

Package

Name: serialize-javascript; View open source insights on deps.dev
Purl: pkg:npm/serialize-javascript

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

7.0.5

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-qj8w-gfj5-8c6v/GHSA-qj8w-gfj5-8c6v.json"