What is CVE-2021-29506?

CVE-2021-29506 is a medium-severity vulnerability in Graphhopper, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2021-05-13.

How severe is CVE-2021-29506?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Graphhopper

CVE-2021-29506

GraphHopper is an open-source Java routing engine. In GrassHopper from version 2.0 and before version 2.4, there is a regular expression injection vulnerability that may lead to Denial of Service. This has been patched in 2.4 and 3.0 See this pull request for the fix: https://github.com/graphhopper/graphhopper/pull/2304

Vulnerability class: DoS (Denial of Service)

Published 2021-05-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.014 (71.5th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Graphhopper — versions >= 2.0, < 2.4

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

github.com/graphhopper/graphhopper/security/advisories/GHSA-hf44-3mx6-vhhw (Third Party Advisory)
github.com/graphhopper/graphhopper/pull/2304 (Patch, Third Party Advisory)
github.com/graphhopper/graphhopper/commit/eb189be1fa7443ebf4ae881e737a18f818c95… (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-29506?: CVE-2021-29506 is a medium-severity vulnerability in Graphhopper, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2021-05-13.
How severe is CVE-2021-29506?: Medium severity. CVSS v3 base score is 6.5 out of 10.