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CVE-2026-48521

envoy · Vulnerability

CVSS 3.1 5.9 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-48521

Published

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 ProdClusterManagerFactory::allocateConnPool dereferences transport_socket_options while selecting an HTTP/3 connection pool without first checking whether the pointer is null. LoadBalancerContext implementations used by synthetic, mirror, health-check, and async-client calls can return no transport-socket options. With auto_config and HTTP/3 enabled, routine traffic reaching one of those contexts can crash an Envoy worker. The relevant scope boundary is that the affected branch requires HTTP/3 in the protocol set and a context that supplies no transport-socket options. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-48521

Published

envoy

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "envoyproxy",
                    "product": "envoy",
                    "versions": [
                        {
                            "version": "< 1.36.10",
                            "status": "affected"
                        },
                        {
                            "version": ">= 1.37.0, < 1.37.6",
                            "status": "affected"
                        },
                        {
                            "version": ">= 1.38.0, < 1.38.4",
                            "status": "affected"
                        },
                        {
                            "version": ">= 1.39.0, < 1.39.1",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON