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CVE-2026-50149— Contour has Improper JWT Verification for Non-SNI Requests on Virtual Hosts with Fallback Certificate Enabled

Quick assessment

Affected
projectcontour contour
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

projectcontour Contour是projectcontour团队开源的一款使用Envoy代理的Kubernetes入口控制器。 projectcontour contour 1.23.0版本至1.33.4版本存在加密问题漏洞，该漏洞源于对HTTPProxy配置中enableFallbackCertificate与jwtProviders不兼容组合的验证不当，可能导致未发送TLS SNI或发送无法识别SNI的客户端请求绕过JWT验证并代理到上游服务。

CVSS 6.5 · Medium EPSS 0.18% · P8

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
projectcontour contour >= 1.23.0, < 1.33.5 affected
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I. Basic Information for CVE-2026-50149

Vulnerability Information
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Vulnerability Title
Contour has Improper JWT Verification for Non-SNI Requests on Virtual Hosts with Fallback Certificate Enabled
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
projectcontour contour 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
projectcontour Contour是projectcontour团队开源的一款使用Envoy代理的Kubernetes入口控制器。 projectcontour contour 1.23.0版本至1.33.4版本存在加密问题漏洞，该漏洞源于对HTTPProxy配置中enableFallbackCertificate与jwtProviders不兼容组合的验证不当，可能导致未发送TLS SNI或发送无法识别SNI的客户端请求绕过JWT验证并代理到上游服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
projectcontour contour >= 1.23.0, < 1.33.5 -

II. Public POCs for CVE-2026-50149

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III. Intelligence Information for CVE-2026-50149

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Vendor Advisories for CVE-2026-50149 (1)

IV. Related Vulnerabilities

Same product: contour
Same vendor: projectcontour
Same weakness: CWE-295

V. Comments for CVE-2026-50149

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