CVE-2026-47220
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Envoy
PublishedJun 26, 2026
First seenJun 26, 2026
Weakness typeCWE-476NULL pointer dereference
How to fix
Update
- envoyproxy envoy1.37.5, 1.38.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| envoyproxy envoy | 1.37.0 ≤ v < 1.37.5, 1.38.0 ≤ v < 1.38.3 | 1.37.5, 1.38.3 |
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