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

EPSS 0.06% · P19
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
大小写敏感处理不恰当
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
caddyservercaddy < 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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Same Patch Batch · caddyserver · 2026-02-24 · 6 CVEs total

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