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CVE-2025-7339

3.4 · LOW

on-headers is a node.js middleware for listening to when a response writes headers.

Published Jul 17, 2025CWE-241EPSS 0.19%

Overview

CVE-2025-7339 is a low-severity vulnerability. It was published on July 17, 2025 and has a CVSS 3.1 base score of 3.4 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.4, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

on-headers is a node.js middleware for listening to when a response writes headers. A bug in on-headers versions `<1.1.0` may result in response headers being inadvertently modified when an array is passed to `response.writeHead()`. Users should upgrade to version 1.1.0 to receive a patch. Uses are strongly encouraged to upgrade to `1.1.0`, but this issue can be worked around by passing an object to `response.writeHead()` rather than an array.

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

Refcna.openjsf.org/security-advisories.htmlGitHubgithub.com/expressjs/morgan/issues/315GitHubgithub.com/jshttp/on-headers/commit/c6e384908c9c6127d18831d16ab0bd96e1231867GitHubgithub.com/jshttp/on-headers/issues/15GitHubgithub.com/jshttp/on-headers/security/advisories/GHSA-76c9-3jph-rj3q

How CyberStrike helps

Frequently asked questions

What is CVE-2025-7339?

CVE-2025-7339 is a low-severity vulnerability. It was published on July 17, 2025 and has a CVSS 3.1 base score of 3.4 (LOW).

How severe is CVE-2025-7339?

This vulnerability has a CVSS 3.1 base score of 3.4, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-7339?

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-2025-7339?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-7339 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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