How severe is CVE-2020-8268?

CVE-2020-8268 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2020-8268 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-8268?

CVE-2020-8268 affects Json8-merge-patch Project Json8-merge-patch. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-8268?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-8268 published?

CVE-2020-8268 was published on 2020-11-09 and last updated on 2026-06-17.

CVE-2020-8268

CVE-2020-8268 is a high-severity vulnerability in Json8-merge-patch Project Json8-merge-patch with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Json8-merge-patch Project Json8-merge-patch
Published: 2020-11-09
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2020-8268?: CVE-2020-8268 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2020-8268 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-8268?: CVE-2020-8268 affects Json8-merge-patch Project Json8-merge-patch. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-8268?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-8268 published?: CVE-2020-8268 was published on 2020-11-09 and last updated on 2026-06-17.

References

https://hackerone.com/reports/980649

Affected products (1)

cpe:2.3:a:json8-merge-patch_project:json8-merge-patch:*:*:*:*:*:node.js:*:*

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