CVE-2026-77281

Caddy is an extensible server platform that uses TLS by default. In version 2.11.3 and earlier, three configuration-dependent weaknesses affect the handler and placeholder layer. In modules/caddyhttp/rewrite/rewrite.go, Rewrite.Rewrite() can pass attacker-controlled replacement bytes through buildQueryString for a second placeholder expansion when a rewrite URI ends with a literal question mark, allowing injected environment or request-variable placeholders to disclose data and, when the file provider is registered, allowing injected file placeholders to disclose readable files. The issue is fixed in version 2.11.4.

• CWE-94
• CWE-178
• CWE-770

• https://github.com/caddyserver/caddy/commit/176b043b0104cee3f894023cd5a598ac29e404bb
• https://github.com/caddyserver/caddy/pull/7761
• https://github.com/caddyserver/caddy/releases/tag/v2.11.4
• https://github.com/caddyserver/caddy/security/advisories/GHSA-j8px-rmrx-76h9

Published

Sep 17, 2026

Last Modified

Sep 18, 2026

Status

Received

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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