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CVE-2026-73553

7.5 · HIGH

Envoy is an open source edge and service proxy designed for cloud-native applications.

Published Sep 21, 2026envoyproxyCWE-436EPSS 0.51%

Overview

CVE-2026-73553 is a high-severity vulnerability affecting envoyproxy envoy. It was published on September 21, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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, When ignore_path_parameters_in_path_matching is enabled, Envoy's router strips the semicolon suffix before matching but the RBAC url_path matcher evaluates the raw path. A downstream request such as /admin;x can therefore miss a DENY rule for /admin while the router still selects the protected /admin backend. The inconsistent canonicalization allows an unauthenticated client to bypass path-based authorization. The relevant scope boundary is that the route option and a path-based RBAC rule must both be present, and the protected route must match after stripping. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

Remediation

Check the references section for vendor advisories and patches from envoyproxy. Update envoy to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
envoyproxyenvoy>= 0, < 1.36.10Affected

References

GitHubgithub.com/envoyproxy/envoy/commit/0be4a0302ea94a894e470817c2edfbd5ed90d273GitHubgithub.com/envoyproxy/envoy/commit/6a703a375a20e3bf98140ee5f5522c614adee7b6GitHubgithub.com/envoyproxy/envoy/commit/b6ec9b66cc33a415e2fa81a6fa8363cac4772dd1GitHubgithub.com/envoyproxy/envoy/commit/e6d5fe885409ebb335ed3934a167f0bcfea471f2GitHubgithub.com/envoyproxy/envoy/releases/tag/v1.36.10GitHubgithub.com/envoyproxy/envoy/releases/tag/v1.37.6GitHubgithub.com/envoyproxy/envoy/releases/tag/v1.38.4GitHubgithub.com/envoyproxy/envoy/releases/tag/v1.39.1GitHubgithub.com/envoyproxy/envoy/security/advisories/GHSA-77x5-xqjg-hprqGitHubgithub.com/envoyproxy/envoy/security/advisories/GHSA-77x5-xqjg-hprq

How CyberStrike helps

Frequently asked questions

What is CVE-2026-73553?

CVE-2026-73553 is a high-severity vulnerability affecting envoyproxy envoy. It was published on September 21, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-73553?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-73553?

Check the references section for vendor advisories and patches from envoyproxy. Update envoy to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-73553?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-73553 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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