Denial of Service Vulnerability in Envoy Proxy
CVE-2026-47220

7.5HIGH

Key Information:

Vendor

Envoyproxy

Status
Envoy
Vendor
CVE Published:
26 June 2026

What is CVE-2026-47220?

Envoy Proxy, a popular open-source edge and service proxy for cloud-native applications, has a vulnerability that could lead to a Denial of Service. This occurs when the log format utilizes the %REQUESTED_SERVER_NAME(X:Y)% directive alongside specific host-related options such as HOST_FIRST or SNI_FIRST, and the host header is absent in the request. This can cause Envoy to crash. The issue has been resolved in versions 1.37.5 and 1.38.3, making it crucial for users to upgrade to these versions to ensure the resilience of their applications.

Affected Version(s)

envoy >= 1.38.0, < 1.38.3 < 1.38.0, 1.38.3

envoy >= 1.37.0, < 1.37.5 < 1.37.0, 1.37.5

References

https://github.com/envoyproxy/envoy/security/advisories/G...
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CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.