CVE-2026-73549: Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's…

PriorityP430medium5.3CVSS 3.1

AVNACHPRLUINSUCNINAH

EPSS

0.62%

49.0th percentile

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's Utility::copyInternetAddressAndPort and QUIC client-address paths reconstruct scoped IPv6 addresses through addressAsString and Ipv6Instance. The string includes a percent scope identifier that inet_pton cannot parse, causing an exception or abort. Kernel-provided scoped IPv6 destinations in ORIGINAL_DST transparent-proxy deployments, and affected QUIC connection paths, can therefore terminate the process. The relevant scope boundary is that the HTTP use_http_header override rejects scoped addresses earlier; the advisory's crash path requires a kernel-provided original destination or the affected QUIC path. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

Affected

5 ranges

Vendor	Product	Version range	Fixed in
envoyproxy	envoy	< 1.36.10	1.36.10
envoyproxy	envoy	>= 1.37.0 < 1.37.6	1.37.6
envoyproxy	envoy	>= 1.38.0 < 1.38.4	1.38.4
envoyproxy	envoy	>= 1.39.0 < 1.39.1	1.39.1
openshift-service-mesh	istio-proxyv2-rhel9	—	—

CVSS provenance

nvdv3.15.3MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

vendor_redhat5.3MEDIUM

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