CVE-2020-8268: Prototype pollution vulnerability in json8-merge-patch npm package < 1.0.3 may allow attackers to inject or mo

Q: How urgent is CVE-2020-8268?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2020-8268 is a high-severity flaw (CVSS 7.5) affecting json8-merge-patch. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Weakness	CWE-471, CWE-20
Published	2020-11-09
Last modified	2026-06-17

Publisher (CNA): HackerOne · Vendor: json8-merge-patch project

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

Am I affected?

Timeline

2020-11-09 15:15 UTCPublished CVE record published
2026-06-17 03:26 UTCUpdated Record last modified

json8-merge-patch project json8-merge-patch UPGRADE

Affected: < 1.0.3

Fixed in: 1.0.3

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls json8-merge-patch

2. UPGRADE to 1.0.3

npm install json8-merge-patch@">=1.0.3"

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-2020-8268?

json8-merge-patch: upgrade to 1.0.3. Exact commands for each OS are on this page.

Is CVE-2020-8268 being exploited?

CVE-2020-8268 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-2020-8268 affect?

CVE-2020-8268 affects json8-merge-patch. Severity is high (CVSS 7.5). 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.

How urgent is CVE-2020-8268?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

npm packages vulnerabilities

References

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