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Arbitrary Code Injection Affecting caddy package, versions <2.11.4-r0

Severity

 Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.36% (30th percentile)

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  • Snyk IDSNYK-MINIMOSLATEST-CADDY-19957835
  • published20 Sept 2026
  • disclosed17 Sept 2026
Report a new vulnerability Found a mistake?

Introduced: 17 Sep 2026

NewCVE-2026-77281  (opens in a new tab)
CWE-94  (opens in a new tab)
CWE-178  (opens in a new tab)
CWE-770  (opens in a new tab)

How to fix?

Upgrade Minimos:latest caddy to version 2.11.4-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream caddy package and not the caddy package as distributed by Minimos. See How to fix? for Minimos:latest relevant fixed versions and status.

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.