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CVE-2026-47220

7.5 · HIGH

Envoy is an open source edge and service proxy designed for cloud-native applications.

Published Jun 26, 2026CWE-476EPSS 0.66%

Overview

CVE-2026-47220 is a high-severity vulnerability. It was published on June 26, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.37.0 until 1.37.5 and 1.38.3, when the %REQUESTED_SERVER_NAME(X:Y)% is used in log format and host related options is specified, like HOST_FIRST, SNI_FIRST, it's possible to crash Envoy when the specified host header is missing in the request headers. This vulnerability is fixed in 1.37.5 and 1.38.3.

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/envoyproxy/envoy/security/advisories/GHSA-j9wh-4qfm-wf2vRefaccess.redhat.com/security/cve/CVE-2026-47220Refbugzilla.redhat.com/show_bug.cgi?id=2493652GitHubgithub.com/envoyproxy/envoy/security/advisories/GHSA-j9wh-4qfm-wf2vRefsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47220.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-47220?

CVE-2026-47220 is a high-severity vulnerability. It was published on June 26, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-47220?

This vulnerability has a CVSS 3.1 base score of 7.5, 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-2026-47220?

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-2026-47220?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-47220 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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