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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| envoyproxy | envoy | >= 1.38.0, < 1.38.3, >= 1.37.0, < 1.37.5 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | istioctl | 1.30.2-1.1 | openSUSE-SU-2026:11141-1 |
Advisories 2
- WID-SEC-2026-2048 Google Cloud Service Mesh und Envoy Proxy: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 3, 2026
- openSUSE-SU-2026:11141-1 istioctl-1.30.2-1.1 on GA media SUSE / openSUSE Security Updates · Jun 29, 2026