CVEvulnerability

CVE-2026-73549

5.3 MEDIUM Published 2026-09-21 Modified 2026-10-05 Official page ↗
Status
Analyzed
Published
2026-09-21
Last modified
2026-10-05
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.3 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-754

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.

Affected configurations

• envoyproxy envoy (< 1.36.10) • envoyproxy envoy (>= 1.37.0 < 1.37.6) • envoyproxy envoy (>= 1.38.0 < 1.38.4) • envoyproxy envoy (>= 1.39.0 < 1.39.1)

Related

Weakness · CWE (1)

  • CWE-754 Improper Check for Unusual or Exceptional Conditions weakness

References