---
id: CVE-2026-73546
title: >-
  Envoy is an open source edge and service proxy designed for cloud-native
  applications
summary: >-
  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
  /stats?format=html admin endpoint uses StatsHtmlRender, which sanitizes string
  statistic values …
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-79
vendor: envoyproxy
product: envoy
affected:
  - envoy < 1.36.10
  - 'envoy >= 1.37.0, < 1.37.6'
  - 'envoy >= 1.38.0, < 1.38.4'
  - 'envoy >= 1.39.0, < 1.39.1'
patched:
  - envoy 1.39.1
published: '2026-09-21'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T13:40:45.403'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73546'
references:
  - url: >-
      https://github.com/envoyproxy/envoy/commit/11d34660ca0322eb125d045a564d9d87f016397f
    label: security-advisories@github.com
  - url: >-
      https://github.com/envoyproxy/envoy/commit/884d30c56b835d5801733ae1dc38c94a08de23e8
    label: security-advisories@github.com
  - url: >-
      https://github.com/envoyproxy/envoy/commit/9484e17c34353662f9bfd30c74f61fa8c9ee7b83
    label: security-advisories@github.com
  - url: >-
      https://github.com/envoyproxy/envoy/commit/ab63a0e52b5a28472f2ff865b6464ae4004f7593
    label: security-advisories@github.com
  - url: 'https://github.com/envoyproxy/envoy/releases/tag/v1.36.10'
    label: security-advisories@github.com
  - url: 'https://github.com/envoyproxy/envoy/releases/tag/v1.37.6'
    label: security-advisories@github.com
  - url: 'https://github.com/envoyproxy/envoy/releases/tag/v1.38.4'
    label: security-advisories@github.com
  - url: 'https://github.com/envoyproxy/envoy/releases/tag/v1.39.1'
    label: security-advisories@github.com
  - url: >-
      https://github.com/envoyproxy/envoy/security/advisories/GHSA-pv9h-4fxf-7vrg
    label: security-advisories@github.com
  - url: >-
      https://github.com/envoyproxy/envoy/security/advisories/GHSA-pv9h-4fxf-7vrg
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-73546.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-73546'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2512092'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-73546'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73546'
  - url: 'https://access.redhat.com/errata/RHSA-2026:65106'
  - url: 'https://access.redhat.com/errata/RHSA-2026:65112'
  - url: 'https://access.redhat.com/errata/RHSA-2026:65113'
  - url: 'https://access.redhat.com/errata/RHSA-2026:65115'
  - url: 'https://access.redhat.com/errata/RHSA-2026:65121'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
epss: 0.00618
epssPercentile: 0.49388
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-21T20:07:05.340873Z'
ingestedAt: '2026-09-21T20:52:58.285Z'
---

## Overview

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 /stats?format=html admin endpoint uses StatsHtmlRender, which sanitizes string statistic values but emits statistic names without HTML encoding. A data-plane component such as grpc_stats with stats_for_all_methods enabled can incorporate attacker-controlled path segments into cached dynamic statistic names. When an operator views the HTML stats page, the stored name can execute script with the admin interface's origin and issue privileged same-origin requests. The relevant scope boundary is that the admin interface must be browser-accessible and an enabled component must persist attacker-influenced text in statistic names. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

## Affected

- `envoy < 1.36.10`
- `envoy >= 1.37.0, < 1.37.6`
- `envoy >= 1.38.0, < 1.38.4`
- `envoy >= 1.39.0, < 1.39.1`

## Remediation

Upgrade past the affected range:

- `envoy 1.39.1`

## Vendor advisories

- **RHSA-2026:65106** · Red Hat · fixed in: Red Hat OpenShift Service Mesh 3.0 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65106)
- **RHSA-2026:65112** · Red Hat · fixed in: Red Hat OpenShift Service Mesh 3.1 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65112)
- **RHSA-2026:65113** · Red Hat · fixed in: Red Hat OpenShift Service Mesh 3.2 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65113)
- **RHSA-2026:65115** · Red Hat · fixed in: Red Hat OpenShift Service Mesh 3.3 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65115)
- **RHSA-2026:65121** · Red Hat · fixed in: Red Hat OpenShift Service Mesh 3.4 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65121)