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.
Metrics
Affected Vendors & Products
References
History
Sun, 20 Sep 2026 03:30:00 +0000
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| Metrics |
ssvc
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Fri, 18 Sep 2026 12:15:00 +0000
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| First Time appeared |
Caddyserver
Caddyserver caddy |
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| Vendors & Products |
Caddyserver
Caddyserver caddy |
Thu, 17 Sep 2026 21:15:00 +0000
| Type | Values Removed | Values Added |
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| 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. | |
| Title | Caddy: rewrite placeholder re-expansion | |
| Weaknesses | CWE-178 CWE-770 CWE-94 |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-09-17T21:04:58.400Z
Updated: 2026-09-18T14:43:34.818Z
Reserved: 2026-08-20T19:14:21.331Z
Link: CVE-2026-77281
Updated: 2026-09-18T14:39:57.835Z
Status : Awaiting Analysis
Published: 2026-09-17T21:17:37.890
Modified: 2026-09-24T21:16:28.120
Link: CVE-2026-77281
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