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HIGH

CVE-2020-5258

CVSS v3

7.7

HIGH

EPSS Score

4.0 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • dojonpmfrom 1.16.0 · fixed in 1.16.2

Vendor advisories

  • CVE-2020-5258 Red Hat Product Security

    dojo: Prototype pollution in deepCopy method could result in code injection

Full record on NVD

Description

In affected versions of dojo (NPM package), the deepCopy method is vulnerable to Prototype Pollution. Prototype Pollution refers to the ability to inject properties into existing JavaScript language construct prototypes, such as objects. An attacker manipulates these attributes to overwrite, or pollute, a JavaScript application object prototype of the base object by injecting other values. This has been patched in versions 1.12.8, 1.13.7, 1.14.6, 1.15.3 and 1.16.2

Technical details

Published
2020-03-10

Frequently asked questions

What is CVE-2020-5258?

In affected versions of dojo (NPM package), the deepCopy method is vulnerable to Prototype Pollution. Prototype Pollution refers to the ability to inject properties into existing JavaScript language construct prototypes, such as objects. An attacker manipulates these attributes to overwrite, or pollute, a JavaScript application object prototype of the base object by injecting other values. This has been patched in versions 1.12.8, 1.13.7, 1.14.6, 1.15.3 and 1.16.2

Is CVE-2020-5258 actively exploited?

Active exploitation of CVE-2020-5258 has not been confirmed. Its EPSS score was 4.0% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-5258?

CVE-2020-5258 has a CVSS v3 base score of 7.7 (HIGH severity).

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