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 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.

• CWE-754

• https://github.com/envoyproxy/envoy/commit/109e5a5b08ad10d99074cefd55a747a16ee64da7
• https://github.com/envoyproxy/envoy/commit/59b1744a6cb62746db418ac06fc5e359fd25fdb7
• https://github.com/envoyproxy/envoy/commit/6e39f4c94deff7a60d382c2d95883e0ea49ff691
• https://github.com/envoyproxy/envoy/commit/ab2dca2d65b079768230a7c3d825afeefa330215
• https://github.com/envoyproxy/envoy/releases/tag/v1.36.10
• https://github.com/envoyproxy/envoy/releases/tag/v1.37.6
• https://github.com/envoyproxy/envoy/releases/tag/v1.38.4
• https://github.com/envoyproxy/envoy/releases/tag/v1.39.1
• https://github.com/envoyproxy/envoy/security/advisories/GHSA-jp5f-qr64-c9vw

Published

Sep 21, 2026

Last Modified

Sep 23, 2026

Status

Awaiting Analysis

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-7354Out of bounds read and write in Angle in Google Chrome prior…8.8
• CVE-2026-73541Allocation of Resources Without Limits or Throttling in ZenH…8.2
• CVE-2026-73542Multiple SEIKO EPSON printers and scanners contain revoked r…3.7
• CVE-2026-73546Envoy is an open source edge and service proxy designed for …7.4
• CVE-2026-73547Envoy is an open source edge and service proxy designed for …7.5
• CVE-2026-73548Envoy is an open source edge and service proxy designed for …7.5
• CVE-2026-7355Use after free in Media in Google Chrome prior to 147.0.7727…8.8
• CVE-2026-73550Envoy is an open source edge and service proxy designed for …7.5
• CVE-2026-73551Envoy is an open source edge and service proxy designed for …5.3
• CVE-2026-73552Envoy is an open source edge and service proxy designed for …7.5
• CVE-2026-73553Envoy is an open source edge and service proxy designed for …7.5
• CVE-2026-73555vLLM is an inference and serving engine for large language m…5.3