What’s Vulnerable › Vulnerabilities

CVE-2021-23408: Prototype Pollution

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-07-21 · updated 2026-06-17
• Weakness: CWE-1321

Description

This affects the package com.graphhopper:graphhopper-web-bundle before 3.2, from 4.0-pre1 and before 4.0. The URL parser could be tricked into adding or modifying properties of Object.prototype using a constructor or __proto__ payload.

Affected products

• com.graphhopper:graphhopper-web-bundle: before 3.2; 4.0-pre1, 4.0-pre2 — fixed in 3.2

How to fix

Upgrade to a fixed version: com.graphhopper:graphhopper-web-bundle 3.2. Check the vendor advisory for mitigations.

References

• https://github.com/graphhopper/graphhopper/pull/2370
• https://github.com/graphhopper/graphhopper/releases/tag/3.1
• https://github.com/graphhopper/graphhopper/releases/tag/3.2
• https://snyk.io/vuln/SNYK-JAVA-COMGRAPHHOPPER-1320114
• https://github.com/graphhopper/graphhopper/pull/2370
• https://github.com/graphhopper/graphhopper/releases/tag/3.1
• https://github.com/graphhopper/graphhopper/releases/tag/3.2
• https://snyk.io/vuln/SNYK-JAVA-COMGRAPHHOPPER-1320114

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