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CVE-2026-65600— Traefik before v2.11.52 Authentication Bypass via ReplacePathRegex

Quick assessment

Affected
traefik traefik
Exploitation
Public or AI PoC available; prioritize validation
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 2.11.51及之前版本、3.6.0至3.6.22版本和3.7.0至3.7.6版本存在路径遍历漏洞，该漏洞源于ReplacePathRegex中间件存在路径遍历问题，可能导致未经身份验证的远程攻击者绕过身份验证。

CVSS 7.8 · High EPSS 0.62% · P48

Affected Version Matrix 6

VendorProduct Version RangeStatus
traefik traefik < 2.11.52 affected
2.11.52 unaffected
3.6.0< 3.6.23 affected
3.6.23 unaffected
3.7.0< 3.7.7 affected
3.7.7 unaffected
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I. Basic Information for CVE-2026-65600

Vulnerability Information
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Vulnerability Title
Traefik before v2.11.52 Authentication Bypass via ReplacePathRegex
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik versions <= v2.11.51, >= v3.6.0 <= v3.6.22, and >= v3.7.0 <= v3.7.6 contain an authentication bypass via path traversal in the ReplacePathRegex middleware. When ReplacePathRegex is configured with a regex that captures user-controlled path segments without a mandatory path separator (e.g. regex "^/api(.*)", replacement "/$1"), the middleware forwards the replaced path to the backend without validating that it matches its normalized form. An unauthenticated remote attacker can send a crafted request (e.g. GET /api../admin) that produces an un-normalized path such as /../admin, which a backend that normalizes paths resolves to a protected route, bypassing authentication middleware. Fixed in v2.11.52, v3.6.23, and v3.7.7.
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
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Traefik 路径遍历漏洞
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 2.11.51及之前版本、3.6.0至3.6.22版本和3.7.0至3.7.6版本存在路径遍历漏洞，该漏洞源于ReplacePathRegex中间件存在路径遍历问题，可能导致未经身份验证的远程攻击者绕过身份验证。
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

Vendor Product Affected Versions CPE Subscribe
traefik traefik 0 ~ 2.11.52 -
traefik traefik 3.6.0 ~ 3.6.23 -
traefik traefik 3.7.0 ~ 3.7.7 -

II. Public POCs for CVE-2026-65600

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 10354 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Trigger conditions & impact
Full executable POC code
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III. Intelligence Information for CVE-2026-65600

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Vendor Advisories for CVE-2026-65600 (2)

Same Patch Batch · traefik · 2026-07-22 · 3 CVEs total

CVE-2026-65601 5.3 MEDIUM Traefik before 3.7.7 Namespace Confusion via HTTPRoute ExtensionRef
CVE-2026-65602 5.3 MEDIUM Traefik before 3.6.23 IngressRouteTCP ServersTransport Namespace Bypass

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-22

V. Comments for CVE-2026-65600

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