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CVE-2026-57439

5.0 · MEDIUM

CyberChef is a web app for encryption, encoding, compression, and data analysis.

Published Jul 8, 2026CWE-79EPSS 0.24%

Overview

CVE-2026-57439 is a medium-severity vulnerability. It was published on July 8, 2026 and has a CVSS 3.1 base score of 5.0 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.0, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

CyberChef is a web app for encryption, encoding, compression, and data analysis. Prior to 11.2.0, the Series Chart operation accepts __proto__ as a key while parsing user-supplied CSV, allowing prototype pollution that can be chained with operations such as Parse UDP to inject malicious JavaScript into HTML output. This issue is fixed in version 11.2.0.

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/gchq/CyberChef/commit/85db3be5d0096859b810f0e8d3e151d5dc9b948fGitHubgithub.com/gchq/CyberChef/issues/2568GitHubgithub.com/gchq/CyberChef/pull/2569GitHubgithub.com/gchq/CyberChef/releases/tag/v11.2.0GitHubgithub.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72cGitHubgithub.com/gchq/CyberChef/security/advisories/GHSA-fx6f-382r-j72c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-57439?

CVE-2026-57439 is a medium-severity vulnerability. It was published on July 8, 2026 and has a CVSS 3.1 base score of 5.0 (MEDIUM).

How severe is CVE-2026-57439?

This vulnerability has a CVSS 3.1 base score of 5.0, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-57439?

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-2026-57439?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-57439 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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