CVE-2026-73551

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

21/09/2026

Last modified:

05/10/2026

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&#39;s URL normalization does not recognize dot and dotdot path segments when they carry semicolon parameters. A request such as /user/..;foo=bar/admin is therefore not canonicalized to /admin even when path normalization is enabled. If an upstream interprets the segment according to RFC 3986 while Envoy applies routing or RBAC to the uncollapsed path, a remote client can cause path confusion and bypass path-based security policy. The relevant scope boundary is that the security consequence depends on a downstream/upstream path interpretation mismatch or a path-based Envoy decision. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N CVSS v3.1 Severity and Metrics:

Base Score: 5.30 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): Low
Integrity (I): None
Availability (A): None

Base Score 3.x

5.30

Severity 3.x

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:envoyproxy:envoy::::::::		1.36.10 (excluding)
cpe:2.3:a:envoyproxy:envoy::::::::	1.37.0 (including)	1.37.6 (excluding)
cpe:2.3:a:envoyproxy:envoy::::::::	1.38.0 (including)	1.38.4 (excluding)
cpe:2.3:a:envoyproxy:envoy::::::::	1.39.0 (including)	1.39.1 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2026-73551

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools