CVE-2026-27585— Caddy's improper sanitization of glob characters in file matcher may lead to bypassing security protections
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I. Basic Information for CVE-2026-27585
Vulnerability Information
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Vulnerability Title
Caddy's improper sanitization of glob characters in file matcher may lead to bypassing security protections
Source: NVD (National Vulnerability Database)
Vulnerability Description
Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, the path sanitization routine in file matcher doesn't sanitize backslashes which can lead to bypassing path related security protections. It affects users with specific Caddy and environment configurations. Version 2.11.1 fixes the issue.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Caddy 输入验证错误漏洞
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之前版本存在输入验证错误漏洞，该漏洞源于文件匹配器中的路径清理程序未清理反斜杠，可能导致绕过路径相关安全保护。
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-2026-27585
| # | POC Description | Source Link | Shenlong Link |
|---|
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- Release v2.11.1 · caddyserver/caddy · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-27585
Same Patch Batch · caddyserver · 2026-02-24 · 6 CVEs total
| CVE-2026-27586 | Caddy's mTLS client authentication silently fails open when CA certificate file is missing | |
| CVE-2026-27587 | Caddy: MatchPath %xx (escaped-path) branch skips case normalization, enabling path-based r | |
| 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
- CVE-2026-30851
Caddy forward_auth copy_headers Does Not Strip Client-Suppli - CVE-2026-30852
Caddy: vars_regexp double-expands user input, leaking env va - CVE-2026-27590
Caddy: Unicode case-folding length expansion causes incorrec - CVE-2026-27589
Caddy vulnerable to cross-origin config application via loca - CVE-2026-27588
Caddy: MatchHost becomes case-sensitive for large host lists
Same vendor: caddyserver
- CVE-2026-30851
Caddy forward_auth copy_headers Does Not Strip Client-Suppli - CVE-2026-30852
Caddy: vars_regexp double-expands user input, leaking env va - CVE-2026-27590
Caddy: Unicode case-folding length expansion causes incorrec - CVE-2026-27589
Caddy vulnerable to cross-origin config application via loca - CVE-2026-27588
Caddy: MatchHost becomes case-sensitive for large host lists
Same weakness: CWE-20
V. Comments for CVE-2026-27585
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