caddy: Caddy is an extensible server platform that uses TLS by default
CVE-2026-77281 is fixed in caddy on 1 platform, first by DEBIAN-CVE-2026-77281, released September 20, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| caddy · Debian 12.15 (bookworm) | 2.6.2-5+deb12u1 | DEBIAN-CVE-2026-77281 | Sep 20, 2026 |
| caddy · Debian 14 | 2.11.4-1 | DEBIAN-CVE-2026-77281 | Sep 20, 2026 |
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