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CVE-2026-6733

3.7 · LOW

Impact: Undici's HTTP/1.1 client is vulnerable to response queue poisoning on reused keep-alive sockets.

Published Jun 17, 2026CWE-367EPSS 0.27%

Overview

CVE-2026-6733 is a low-severity vulnerability. It was published on June 17, 2026 and has a CVSS 3.1 base score of 3.7 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Impact:

Undici's HTTP/1.1 client is vulnerable to response queue poisoning on reused keep-alive sockets. An attacker-controlled upstream server can inject an unsolicited HTTP/1.1 response onto an idle socket after a request completes. When the client dispatches the next request on that socket, it associates the injected response with the new request, causing responses to be delivered to the wrong requests.

This requires an attacker-controlled or compromised upstream HTTP/1.1 server and keep-alive connection reuse.

Patches:

Upgrade to undici v6.26.0, v7.28.0 or v8.5.0.

Workarounds:

Disable keep-alive connection reuse by setting keepAliveTimeout: 0 on the Client or Pool.

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/nodejs/undici/security/advisories/GHSA-35p6-xmwp-9g52Refhackerone.com/reports/3582376

How CyberStrike helps

Frequently asked questions

What is CVE-2026-6733?

CVE-2026-6733 is a low-severity vulnerability. It was published on June 17, 2026 and has a CVSS 3.1 base score of 3.7 (LOW).

How severe is CVE-2026-6733?

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-6733?

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-2026-6733?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-6733 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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