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MEDIUM severity

CVE-2021-23408 — graphhopper-web-bundle

MEDIUMFix: graphhopper/graphhopper#2370

CVE-2021-23408 is a medium-severity (CVSS 4.3) CWE-1321 vulnerability in com.graphhopper:graphhopper-web-bundle. 1 public exploit reference exists, so weaponization risk is real. A fix is available for com.graphhopper:graphhopper-web-bundle — see the affected versions and patch details below.

Prototype Pollution in GraphHopper

Also known asGHSA-qhxh-9hhx-6p7vSNYK-JAVA-COMGRAPHHOPPER-1320114
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs72th percentile — riskier than 72% of all scored CVEsHighest risk
0.00%0.63%1.27%1.90%0.3%1.4%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-23408 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
☕com.graphhopper:graphhopper-web-bundle

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

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 Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavencom.graphhopper:graphhopper-web-bundleall versions3.2com.graphhopper:graphhopper-web-bundle:3.2

Affected Products

1 product · 3 configurations
Application
graphhoppergraphhopper
< 3.2
1 version
4.0
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

This affects the package com.graphhopper:graphhopper-web-bundle before 3…

snyk.ioNVDJul 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.graphhopper:graphhopper-web-bundle, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update com.graphhopper:graphhopper-web-bundle to 3.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-23408 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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CVE-2021-23408: graphhopper-web-bundle — Fixed in 3.2