What is CVE-2020-7751?

CVE-2020-7751 is a medium-severity vulnerability in Chaijis Pathval, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 6.0/10. Published 2020-10-26.

How severe is CVE-2020-7751?

Medium severity. CVSS v3 base score is 6.0 out of 10.

Is CVE-2020-7751 known to be exploited?

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

Prototype Pollution in Chaijis Pathval

CVE-2020-7751

pathval before version 1.1.1 is vulnerable to prototype pollution.

Vulnerability class: Prototype Pollution

Published 2020-10-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.0 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:H.

EPSS exploit prediction

EPSS: 0.015 (73.6th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 73.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Chaijis Pathval
Pathval — versions 0

Weakness classification (CWE)

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

Public proof-of-concept exploits

n0-traces/cve_

References

snyk.io/vuln/SNYK-JS-PATHVAL-596926 (Exploit, Patch, Third Party Advisory)
github.com/chaijs/pathval/pull/58/files (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-7751?: CVE-2020-7751 is a medium-severity vulnerability in Chaijis Pathval, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 6.0/10. Published 2020-10-26.
How severe is CVE-2020-7751?: Medium severity. CVSS v3 base score is 6.0 out of 10.
Is CVE-2020-7751 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.