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7.5 High

CVE-2021-43826 Envoy is an open source edge and service proxy, designed for cloud-native applications

Description

Envoy is an open source edge and service proxy, designed for cloud-native applications. In affected versions of Envoy a crash occurs when configured for :ref:`upstream tunneling <envoy_v3_api_field_extensions.filters.network.tcp_proxy.v3.TcpProxy.tunneling_config>` and the downstream connection disconnects while the the upstream connection or http/2 stream is still being established. There are no workarounds for this issue. Users are advised to upgrade.

Affected products and versions

Product Affected versions Fixed in
envoy 1.21 1.21.0 → < 1.21.1 1.21.1
envoy 1.20 1.20.0 → < 1.20.2 1.20.2
envoy 1.19 1.19.0 → < 1.19.3 1.19.3
envoy 1.18 earliest → < 1.18.6 1.18.6

Other CVEs of envoy

The 98 CVEs of envoy →
CVE-2026-73511 Envoy is an open source edge and service proxy designed for cloud-native applications 5.3 Medium CVE-2026-73553 Envoy is an open source edge and service proxy designed for cloud-native applications 7.5 High CVE-2026-73551 Envoy is an open source edge and service proxy designed for cloud-native applications 5.3 Medium CVE-2026-73546 Envoy is an open source edge and service proxy designed for cloud-native applications 7.4 High
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