CVE-2021-23597: fastify fastify-multipart Prototype Pollution

Vulnerability summary

CVE-2021-23597 is a high (CVSS 7.5) Prototype Pollution vulnerability in fastify fastify-multipart. EPSS estimates a 2.03% chance of exploitation in the next 30 days, higher than 80.7% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 11-02-2022
   PublishedVulnerability first disclosed.
2. 16-09-2024
   Last modifiedVulnerability information updated.

Description

This affects the package fastify-multipart before 5.3.1. By providing a name=constructor property it is still possible to crash the application. **Note:** This is a bypass of CVE-2020-8136 (https://security.snyk.io/vuln/SNYK-JS-FASTIFYMULTIPART-1290382).

• CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.