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CVE-2026-32305— Traefik mTLS bypass via fragmented ClientHello SNI extraction failure

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开源的一款反向代理与负载均衡工具。 Traefik 2.11.40及之前版本、3.0.0-beta1至3.6.11版本和3.7.0-ea.1版本存在安全漏洞，该漏洞源于TLS SNI预嗅探逻辑问题，可能导致绕过路由级mTLS强制执行。

AI Predicted 7.4 Difficulty: Moderate EPSS 0.47% · P39

Affected Version Matrix 3

VendorProduct Version RangeStatus
traefik traefik < 2.11.41 affected
>= 3.0.0-beta1, < 3.6.11 affected
>= 3.7.0-ea.1, < 3.7.0-ea.2 affected
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I. Basic Information for CVE-2026-32305

Vulnerability Information
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Vulnerability Title
Traefik mTLS bypass via fragmented ClientHello SNI extraction failure
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an HTTP reverse proxy and load balancer. Versions 2.11.40 and below, 3.0.0-beta1 through 3.6.11, and 3.7.0-ea.1 are vulnerable to mTLS bypass through the TLS SNI pre-sniffing logic related to fragmented ClientHello packets. When a TLS ClientHello is fragmented across multiple records, Traefik's SNI extraction may fail with an EOF and return an empty SNI. The TCP router then falls back to the default TLS configuration, which does not require client certificates by default. This allows an attacker to bypass route-level mTLS enforcement and access services that should require mutual TLS authentication. This issue is patched in versions 2.11.41, 3.6.11 and 3.7.0-ea.2.
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
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Traefik 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik开源的一款反向代理与负载均衡工具。 Traefik 2.11.40及之前版本、3.0.0-beta1至3.6.11版本和3.7.0-ea.1版本存在安全漏洞，该漏洞源于TLS SNI预嗅探逻辑问题，可能导致绕过路由级mTLS强制执行。
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 < 2.11.41 -

II. Public POCs for CVE-2026-32305

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III. Intelligence Information for CVE-2026-32305

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Vendor Advisories for CVE-2026-32305 (1)

Vendor Pages for CVE-2026-32305 (3)

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-287

V. Comments for CVE-2026-32305

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