What is CVE-2020-8268?

CVE-2020-8268 is a high-severity vulnerability in Json8-Merge-Patch Project, classified under Modification of Assumed-Immutable Data (MAID). CVSS score: 7.5/10. Published 2020-11-09.

How severe is CVE-2020-8268?

High severity. CVSS v3 base score is 7.5 out of 10.

Improper input validation in Json8-Merge-Patch Project

CVE-2020-8268

Prototype pollution vulnerability in json8-merge-patch npm package < 1.0.3 may allow attackers to inject or modify methods and properties of the global object constructor.

Published 2020-11-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.013 (69.8th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Json8-Merge-Patch Project
Json8-Merge-Patch — versions Fixed Version: 1.0.3

Weakness classification (CWE)

References

hackerone.com/reports/980649 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-8268?: CVE-2020-8268 is a high-severity vulnerability in Json8-Merge-Patch Project, classified under Modification of Assumed-Immutable Data (MAID). CVSS score: 7.5/10. Published 2020-11-09.
How severe is CVE-2020-8268?: High severity. CVSS v3 base score is 7.5 out of 10.