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CVE-2026-53622— Traefik: HTTP/3 mTLS bypass via exact SNI TLSOptions lookup for wildcard and mixed-case hosts

Quick assessment

Affected
traefik traefik
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.

Traefik是Traefik公司开源的一款反向代理与负载均衡工具。 Traefik 3.7.3之前版本存在授权问题漏洞，该漏洞源于HTTP/3 (QUIC) TLS配置选择中对SNI值进行精确、区分大小写的查找，未能匹配通配符主机模式或主机名大小写变体，可能导致未经身份验证的客户端绕过路由器特定的mTLS强制策略。

CVSS 7.8 · High EPSS 0.63% · P48

Affected Version Matrix 3

VendorProduct Version RangeStatus
traefik traefik >= 3.7.0, < 3.7.3 affected
>= 3.0.0, < 3.6.18 affected
< 2.11.51 affected
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I. Basic Information for CVE-2026-53622

Vulnerability Information
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Vulnerability Title
Traefik: HTTP/3 mTLS bypass via exact SNI TLSOptions lookup for wildcard and mixed-case hosts
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an HTTP reverse proxy and load balancer. Versions prior to 3.7.3, 3.6.18, and 2.11.51 have a critical vulnerability in Traefik's HTTP/3 (QUIC) TLS configuration selection that allows unauthenticated clients to bypass router-specific mTLS enforcement. When HTTP/3 is enabled on an entrypoint, the TLS handshake selects the applicable TLS configuration through an exact, case-sensitive lookup on the SNI value, which fails to match wildcard host patterns (e.g., *.example.com) or case variants of the configured hostname. Because the handshake falls back to the default TLS configuration — which may not require client certificates — a client can complete the QUIC handshake without presenting a certificate, while the subsequent HTTP routing layer still dispatches the request to a backend protected by a router-specific mTLS policy. The issue affects deployments where HTTP/3 is enabled, a router uses a wildcard Host rule or case-insensitive hostname matching, a router-specific TLSOptions enforces client certificate authentication, and UDP access to the entrypoint is reachable by an attacker. This vulnerability is fixed in versions 3.7.3, 3.6.18, and 2.11.51.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用候选路径或通道进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Traefik 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik公司开源的一款反向代理与负载均衡工具。 Traefik 3.7.3之前版本存在授权问题漏洞，该漏洞源于HTTP/3 (QUIC) TLS配置选择中对SNI值进行精确、区分大小写的查找，未能匹配通配符主机模式或主机名大小写变体，可能导致未经身份验证的客户端绕过路由器特定的mTLS强制策略。
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
traefik traefik >= 3.7.0, < 3.7.3 -

II. Public POCs for CVE-2026-53622

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III. Intelligence Information for CVE-2026-53622

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Patches & Fixes for CVE-2026-53622 (2)

Vendor Advisories for CVE-2026-53622 (3)

Vendor Pages for CVE-2026-53622 (2)

Same Patch Batch · traefik · 2026-06-23 · 6 CVEs total

CVE-2026-48491 7.8 HIGH Traefik: SNICheck ignores wildcard TLSOptions mappings, allowing domain-fronted mTLS bypas
CVE-2026-48020 7.8 HIGH Traefik StripPrefix Route-Level Auth Bypass via Path Normalization
CVE-2023-54365 7.5 HIGH Traefik - Denial of Service via HTTP/2 Request Handling
CVE-2026-54762 Traefik Kubernetes Ingress NGINX provider fails open when auth-secret resolution fails
CVE-2026-54761 Traefik: Kubernetes Gateway crossProviderNamespaces bypass allows HTTPRoute outside the al

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-288

V. Comments for CVE-2026-53622

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