{"id":"CVE-2026-73549","title":"Envoy is an open source edge and service proxy designed for cloud-native applications","summary":"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 addres…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-754","CWE-119"],"vendor":"envoyproxy","product":"envoy","affected":["envoy < 1.36.10","envoy >= 1.37.0, < 1.37.6","envoy >= 1.38.0, < 1.38.4","envoy >= 1.39.0, < 1.39.1"],"patched":["envoy 1.39.1"],"published":"2026-09-21","updated":"2026-10-05","sourceUpdated":"2026-10-05T14:09:22.283","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73549","references":[{"url":"https://github.com/envoyproxy/envoy/commit/109e5a5b08ad10d99074cefd55a747a16ee64da7","label":"security-advisories@github.com"},{"url":"https://github.com/envoyproxy/envoy/commit/59b1744a6cb62746db418ac06fc5e359fd25fdb7","label":"security-advisories@github.com"},{"url":"https://github.com/envoyproxy/envoy/commit/6e39f4c94deff7a60d382c2d95883e0ea49ff691","label":"security-advisories@github.com"},{"url":"https://github.com/envoyproxy/envoy/commit/ab2dca2d65b079768230a7c3d825afeefa330215","label":"security-advisories@github.com"},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.36.10","label":"security-advisories@github.com"},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.37.6","label":"security-advisories@github.com"},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.38.4","label":"security-advisories@github.com"},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.39.1","label":"security-advisories@github.com"},{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-jp5f-qr64-c9vw","label":"security-advisories@github.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-73549.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-73549"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2512090"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-73549"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73549"},{"url":"https://access.redhat.com/errata/RHSA-2026:65106"},{"url":"https://access.redhat.com/errata/RHSA-2026:65112"},{"url":"https://access.redhat.com/errata/RHSA-2026:65113"},{"url":"https://access.redhat.com/errata/RHSA-2026:65115"},{"url":"https://access.redhat.com/errata/RHSA-2026:65121"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00618,"epssPercentile":0.49423,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-22T13:29:09.394045Z"},"ingestedAt":"2026-09-21T19:51:58.869Z","slug":"CVE-2026-73549","body":"## Overview\n\nEnvoy 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.\n\n## Affected\n\n- `envoy < 1.36.10`\n- `envoy >= 1.37.0, < 1.37.6`\n- `envoy >= 1.38.0, < 1.38.4`\n- `envoy >= 1.39.0, < 1.39.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `envoy 1.39.1`\n\n## Vendor advisories\n\n- **RHSA-2026:65106** · Red Hat · fixed in: Red Hat OpenShift Service Mesh 3.0 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65106)\n- **RHSA-2026:65112** · Red Hat · fixed in: Red Hat OpenShift Service Mesh 3.1 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65112)\n- **RHSA-2026:65113** · Red Hat · fixed in: Red Hat OpenShift Service Mesh 3.2 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65113)\n- **RHSA-2026:65115** · Red Hat · fixed in: Red Hat OpenShift Service Mesh 3.3 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65115)\n- **RHSA-2026:65121** · Red Hat · fixed in: Red Hat OpenShift Service Mesh 3.4 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65121)","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}