CVE-2023-44487

CVE-2023-44487 – HTTP/2 Rapid Reset DoS Root cause: HTTP/2 stream resets can cause servers to continue processing, leading to unbounded resource consumption and potential DoS when clients rapidly cancel streams. What’s affected: Various HTTP/2 implementations and deployments, including servers, p...

CVE-2018-21246

Caddy before 0.10.13 mishandles TLS client authentication due to missing StrictHostMatching, enabling an authentication bypass. Affected product: Caddy web server; vulnerability in TLS client auth handling (authentication bypass). CVE-2018-21246 is documented in multiple sources (GHSA, OSV, NVD, ...

CVE-2026-27590

Caddy prior to 2.11.1 is affected. The FastCGI path-splitting logic lowercased the request path to compute a split index, then used that index on the original path; Unicode can change byte length after lowercasing, causing SCRIPT_NAME/SCRIPT_FILENAME and PATH_INFO misalignment. This path confusio...

CVE-2026-27589

Summary: CVE-2026-27589 affects Caddy prior to 2.11.1. The local admin API (default at 127.0.0.1:2019) exposes a state-changing POST /load that can replace the running configuration. If origin enforcement is not enabled, the admin endpoint accepts cross-origin requests and applies an attacker-sup...

CVE-2026-27585

CVE-2026-27585 affects Caddy prior to 2.11.1 due to improper sanitization of backslashes in the file matcher’s path sanitization routine, which can bypass path-related security protections. The issue is fixed in version 2.11.1. Affected environment/configurations are specified as requiring cautio...

CVE-2026-52846

Summary: CVE-2026-52846 affects Caddy's stripHTML template function, which cannot reliably strip certain malformed HTML (e.g., <img src=x onerror=alert()>). This can bypass tag-stripping and may enable client-side XSS when untrusted strings are rendered as HTML. The issue originates in func...

CVE-2026-27586

Summary (CVE-2026-27586): Caddy prior to 2.11.1 has two swallowed errors in ClientAuthentication.provision() that cause mTLS client authentication to silently fail open when the CA certificate file is missing, unreadable, or malformed. The server starts and accepts client certs signed by any syst...

CVE-2026-52844

CVE-2026-52844 describes a Windows-specific path handling bug in Caddy prior to 2.11.4 where path matchers do not normalize backslashes, causing a request like /private%5csecret.txt to bypass path-scoped auth and reach the protected file, e.g., /private/*, through file_server. The issue is exploi...

CVE-2026-52845

Summary (CVE-2026-52845): Caddy 2.11.x contains a bypass in forward_auth copy_headers where, prior to 2.11.4, the exact client-supplied header was deleted but HTTP header names are later normalized to CGI variables, allowing an underscore alias to collide with a trusted header in FastCGI backends...