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CVE-2026-6621

7.3 · HIGH

A vulnerability was determined in 1024bit extend-deep up to 0.1.6.

Published Apr 20, 2026CWE-94EPSS 0.56%

Overview

CVE-2026-6621 is a high-severity vulnerability. It was published on April 20, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A vulnerability was determined in 1024bit extend-deep up to 0.1.6. The impacted element is an unknown function of the file index.js. This manipulation of the argument __proto__ causes improperly controlled modification of object prototype attributes. Remote exploitation of the attack is possible. The exploit has been publicly disclosed and may be utilized. The code repository of the project has not been active for many years.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/sudo-secure/security-research/blob/main/extend-deep/prototype-pollution/PoC.mdRefvuldb.com/submit/792387Refvuldb.com/vuln/358256Refvuldb.com/vuln/358256/cti

How CyberStrike helps

Frequently asked questions

What is CVE-2026-6621?

CVE-2026-6621 is a high-severity vulnerability. It was published on April 20, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2026-6621?

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-6621?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-6621?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-6621 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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