CVE-2021-23597

Description

### Impact This is a bypass of CVE-2020-8136 (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8136). By providing a `name=constructor` property it is still possible to crash the application. The original fix only checks for the key `__proto__` (https://github.com/fastify/fastify-multipart/pull/116). All users are recommended to upgrade ### Patches v5.3.1 includes a patch ### Workarounds No workarounds are possible. ### References Read up https://www.fastify.io/docs/latest/Guides/Prototype-Poisoning/ ### For more information If you have any questions or comments about this advisory: * Open an issue in [https://github.com/fastify/fastify-multipart](https://github.com/fastify/fastify-multipart) * Email us at [hello@matteocollina.com](mailto:hello@matteocollina.com)

How to fix CVE-2021-23597

To remediate CVE-2021-23597, upgrade the affected package to a fixed version below.

• —upgrade to 5.3.1 or later

Is CVE-2021-23597 being exploited?

Low — EPSS is 2.0%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• from 0, < 5.3.1

CVSS scores

References (8)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-23597
• WEBgithub.com/fastify/fastify-multipart
• WEBgithub.com/fastify/fastify-multipart/commit/a70dc7059a794589bd4fe066453141fc609e6066
• WEBgithub.com/fastify/fastify-multipart/pull/116