---
id: CVE-2026-50149
title: Contour is a Kubernetes ingress controller using Envoy proxy
summary: >-
  Contour is a Kubernetes ingress controller using Envoy proxy. In versions
  1.23.0 through 1.33.4, when an `HTTPProxy` is configured with incompatible
  combination of both `.spec.virtualhost.tls.enableFallbackCertificate: true`
  and `.spec.v…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N'
cwe:
  - CWE-295
vendor: projectcontour
product: github.com/projectcontour/contour
affected:
  - 'github.com/projectcontour/contour >= 1.23.0, < 1.33.5'
patched:
  - github.com/projectcontour/contour 1.33.5
published: '2026-08-19'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:09:01.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-50149'
references:
  - url: >-
      https://github.com/projectcontour/contour/security/advisories/GHSA-g3xr-5w5j-w4q4
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-g3xr-5w5j-w4q4'
tags:
  - nvd
  - ghsa
  - go
epss: 0.00147
epssPercentile: 0.04328
ecosystem: go
ingestedAt: '2026-07-02T17:40:39.306Z'
---

## Overview

Contour is a Kubernetes ingress controller using Envoy proxy. In versions 1.23.0 through 1.33.4, when an `HTTPProxy` is configured with incompatible combination of both `.spec.virtualhost.tls.enableFallbackCertificate: true` and `.spec.virtualhost.jwtProviders`, Contour does not reject the configuration. Consequently, requests from clients that do not send TLS SNI or send an unrecognized SNI (one that does not match any `HTTPProxy` FQDN) bypass configured JWT verification and are proxied to upstream services without a valid token. This issue is fixed in Contour v1.33.5. Contour now rejects and marks invalid any `HTTPProxy` resources that combine `.spec.virtualhost.tls.enableFallbackCertificate: true` with `.spec.virtualhost.jwtProviders`. Affected resources will receive a status  condition with the error reason `TLSIncompatibleFeatures`. As a workaround, do not enable `.spec.virtualhost.tls.enableFallbackCertificate` on `HTTPProxy` resources that also define `.spec.virtualhost.jwtProviders`. Remove one of the two settings to avoid the invalid configuration.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-50149)

Affected packages:

- `github.com/projectcontour/contour >= 1.23.0, < 1.33.5`

Patched in:

- `github.com/projectcontour/contour 1.33.5`

Source: https://github.com/advisories/GHSA-g3xr-5w5j-w4q4