CVE-2026-73549

Vulnerability Description

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.

CVSS Score

Affected Products

Related Weaknesses (CWE)

References

• https://github.com/envoyproxy/envoy/commit/109e5a5b08ad10d99074cefd55a747a16ee64Patch
• https://github.com/envoyproxy/envoy/commit/59b1744a6cb62746db418ac06fc5e359fd25fPatch
• https://github.com/envoyproxy/envoy/commit/6e39f4c94deff7a60d382c2d95883e0ea49ffPatch
• https://github.com/envoyproxy/envoy/commit/ab2dca2d65b079768230a7c3d825afeefa330Patch
• https://github.com/envoyproxy/envoy/releases/tag/v1.36.10Release Notes
• https://github.com/envoyproxy/envoy/releases/tag/v1.37.6Release Notes
• https://github.com/envoyproxy/envoy/releases/tag/v1.38.4Release Notes
• https://github.com/envoyproxy/envoy/releases/tag/v1.39.1Release Notes
• https://github.com/envoyproxy/envoy/security/advisories/GHSA-jp5f-qr64-c9vwVendor AdvisoryMitigation