GHSA-qj8w-gfj5-8c6v

Dashboard / Vulnerabilities / GHSA-qj8w-gfj5-8c6v

GHSA-qj8w-gfj5-8c6v

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.

References: https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-qj8w-gfj5-8c6v, https://nvd.nist.gov/vuln/detail/CVE-2026-34043, https://github.com/yahoo/serialize-javascript/commit/f147e90269b58bb6e539cfdf3d0e20d6ad14204b, https://github.com/yahoo/serialize-javascript, https://github.com/yahoo/serialize-javascript/releases/tag/v5.0.0, https://github.com/yahoo/serialize-javascript/releases/tag/v7.0.5