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CVE-2026-27587— Caddy: MatchPath %xx (escaped-path) branch skips case normalization, enabling path-based route/auth bypass

Quick assessment

Affected
caddyserver caddy
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.

Caddy是Caddy公司的一款开源、跨平台的HTTP/Web服务器。 Caddy 2.11.1之前版本存在安全漏洞，该漏洞源于HTTP路径请求匹配器在处理包含百分号转义序列的模式时大小写敏感，可能导致攻击者绕过基于路径的路由和访问控制。

AI Predicted 7.5 Difficulty: Easy EPSS 0.37% · P30
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I. Basic Information for CVE-2026-27587

Vulnerability Information
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Vulnerability Title
Caddy: MatchPath %xx (escaped-path) branch skips case normalization, enabling path-based route/auth bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's HTTP `path` request matcher is intended to be case-insensitive, but when the match pattern contains percent-escape sequences (`%xx`) it compares against the request's escaped path without lowercasing. An attacker can bypass path-based routing and any access controls attached to that route by changing the casing of the request path. Version 2.11.1 contains a fix for the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
大小写敏感处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Caddy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Caddy是Caddy公司的一款开源、跨平台的HTTP/Web服务器。 Caddy 2.11.1之前版本存在安全漏洞，该漏洞源于HTTP路径请求匹配器在处理包含百分号转义序列的模式时大小写敏感，可能导致攻击者绕过基于路径的路由和访问控制。
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
caddyserver caddy < 2.11.1 -

II. Public POCs for CVE-2026-27587

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III. Intelligence Information for CVE-2026-27587

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Vendor Pages for CVE-2026-27587 (1)

Same Patch Batch · caddyserver · 2026-02-24 · 6 CVEs total

CVE-2026-27585 Caddy's improper sanitization of glob characters in file matcher may lead to bypassing sec
CVE-2026-27586 Caddy's mTLS client authentication silently fails open when CA certificate file is missing
CVE-2026-27588 Caddy: MatchHost becomes case-sensitive for large host lists (>100), enabling host-based r
CVE-2026-27590 Caddy: Unicode case-folding length expansion causes incorrect split_path index (SCRIPT_NAM
CVE-2026-27589 Caddy vulnerable to cross-origin config application via local admin API /load (caddy)

IV. Related Vulnerabilities

Same product: caddy
Same vendor: caddyserver
Same weakness: CWE-178

V. Comments for CVE-2026-27587

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