CVE-2021-23408: This affects the package com.graphhopper:graphhopper-web-bundle before 3.2, from 4.0-pre1 and before 4.0

Q: How do I fix CVE-2021-23408?

graphhopper: upgrade to 3.2. Exact commands for each OS are on this page.

Q: Is CVE-2021-23408 being exploited?

CVE-2021-23408 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-23408 affect?

CVE-2021-23408 affects graphhopper. Severity is medium (CVSS 5.4). 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.

Q: How urgent is CVE-2021-23408?

Priority 42/100. Public exploit reference

This month

MEDIUM 5.4UPGRADE

CVE-2021-23408 is a medium-severity flaw (CVSS 5.4) affecting graphhopper. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-1321
Published	2021-07-21
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: graphhopper

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-07-21 16:15 UTCPublished CVE record published
2026-06-17 03:38 UTCUpdated Record last modified

graphhopper graphhopper UPGRADE

Affected: < 3.2 · 4.0 pre1 · 4.0 pre2

Fixed in: 3.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy graphhopper || rpm -q graphhopper || graphhopper --version

2. UPGRADE to 3.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade graphhopper

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade graphhopper

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-23408?

graphhopper: upgrade to 3.2. Exact commands for each OS are on this page.

Is CVE-2021-23408 being exploited?

CVE-2021-23408 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-23408 affect?

CVE-2021-23408 affects graphhopper. Severity is medium (CVSS 5.4). 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.

How urgent is CVE-2021-23408?

Priority 42/100. Public exploit reference

Related CVEs

CVE-2021-29506 MEDIUM 6.5 UPGRADE GraphHopper is an open-source Java routing engine

References

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