What is CVE-2020-36604?

CVE-2020-36604 is a high-severity vulnerability in Hapijs Hoek, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 8.1/10. Published 2022-09-23.

How severe is CVE-2020-36604?

High severity. CVSS v3 base score is 8.1 out of 10.

Is CVE-2020-36604 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Prototype Pollution in Hapijs Hoek

CVE-2020-36604

hoek before 8.5.1 and 9.x before 9.0.3 allows prototype poisoning in the clone function.

Vulnerability class: Prototype Pollution

Published 2022-09-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (68.7th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 68.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Hapijs Hoek

Weakness classification (CWE)

CWE-1321 — Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

Public proof-of-concept exploits

References

github.com/hapijs/hoek/issues/352 (Third Party Advisory)
security.snyk.io/vuln/SNYK-JS-HAPIHOEK-548452)

Frequently asked questions

What is CVE-2020-36604?: CVE-2020-36604 is a high-severity vulnerability in Hapijs Hoek, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 8.1/10. Published 2022-09-23.
How severe is CVE-2020-36604?: High severity. CVSS v3 base score is 8.1 out of 10.
Is CVE-2020-36604 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.