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CVE-2026-71326— Traefik: BasicAuth singleflight key collision allows authenticated identity spoofing

CVSS 2.1 · Low EPSS 0.36% · P29

Possible ATT&CK Techniques 1AI

T1078 · Valid Accounts

Affected Version Matrix 2

VendorProductVersion RangeStatus
traefiktraefik>= 3.6.11, < 3.6.25affected
>= 3.7.0, < 3.7.10affected
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I. Basic Information for CVE-2026-71326

Vulnerability Information
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Vulnerability Title
Traefik: BasicAuth singleflight key collision allows authenticated identity spoofing
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an open source HTTP reverse proxy and load balancer. From 3.6.11 until 3.6.25 and 3.7.10, Traefik's BasicAuth middleware in pkg/middlewares/auth/basic_auth.go deduplicates concurrent password checks with a singleflight key built from the delimiter-free concatenation of password and secret, allowing an attacker who has a valid credential and the stored hash to authenticate as an unconfigured username when headerField trusts the forwarded identity. This issue is fixed in 3.6.25 and 3.7.10.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/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 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik公司开源的一款负载均衡器。 Traefik 3.6.11版本至3.6.25之前版本和3.7.0版本至3.7.10之前版本存在授权问题漏洞，该漏洞源于BasicAuth中间件在并发密码检查时使用无分隔符拼接的singleflight key进行去重，当headerField信任转发身份时，可能允许拥有有效凭据和存储哈希的攻击者以未配置的用户名进行身份验证。
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

VendorProductAffected VersionsCPESubscribe
traefiktraefik >= 3.6.11, < 3.6.25 -

II. Public POCs for CVE-2026-71326

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III. Intelligence Information for CVE-2026-71326

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Patches & Fixes for CVE-2026-71326 (2)

Vendor Advisories for CVE-2026-71326 (1)

Vendor Pages for CVE-2026-71326 (2)

Same Patch Batch · traefik · 2026-08-06 · 4 CVEs total

CVE-2026-713277.6 HIGHTraefik: Gateway API route identity collision allows cross-namespace backend hijacking
CVE-2026-713247.0 HIGHTraefik: Cross-user response poisoning via proxied CONNECT on Traefik's shared backend kee
CVE-2026-713254.8 MEDIUMTraefik: `allowCrossNamespace=false` bypass via `@kubernetescrd` TraefikService backendRef

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-71326

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