Description
Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.34.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, PROXY Protocol v2 header generator emits TLVs beyond the maximum length of 65535 bytes, causing a mismatch between bytes written and the length field in the header. This can result in smuggled bytes on the upstream request. This vulnerability is fixed in 1.35.13, 1.36.9, 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, >= 1.36.0, < 1.36.9, >= 1.34.0, < 1.35.13 | — |
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