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CVE-2026-47220
Envoy: Segmentation fault when using %REQUESTED_SERVER_NAME% in log format
Overview
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.

Details
INFO

Published Date :

June 26, 2026, 6:02 p.m.

Last Modified :

June 26, 2026, 6:02 p.m.

Remotely Exploit :

No

Source :

GitHub_M
Impact
Affected Products

The following products are affected by CVE-2026-47220 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Envoyproxy envoy
: Total Affected Vendor : 1 | Products : 1
Solution
Update Envoy to a fixed version to prevent crashes.
  • Update Envoy to version 1.37.5 or later.
  • Update Envoy to version 1.38.3 or later.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

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EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
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