CVE-2026-77281
Description
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.
How to fix
- github.com/caddyserver/caddy/v22.11.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/caddyserver/caddy/v2Go | v < 2.11.4 | 2.11.4 |
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