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Untriaged
Permalink CVE-2026-77281
6.5 MEDIUM
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): None (N)
  • User Interaction (UI): None (N)
  • Scope (S): Unchanged (U)
  • Confidentiality (C): Low (L)
  • Integrity (I): None (N)
  • Availability (A): Low (L)
  • Modified Attack Vector (MAV): Network (N)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): None (N)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): Low (L)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): None (N)
  • Modified Availability (MA): Low (L)
created 5 days, 19 hours ago Activity log
  • Created suggestion 5 days, 19 hours ago
Caddy: rewrite placeholder re-expansion

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.

Affected products

caddy
  • ==< 2.11.4

Matching in nixpkgs

pkgs.caddy

Fast and extensible multi-platform HTTP/1-2-3 web server with automatic HTTPS

  • nixos-unstable -
  • nixos-26.05 -

pkgs.xcaddy

Build Caddy with plugins

  • nixos-unstable -
    • nixos-unstable-small 0.4.6
  • nixos-26.05 -
    • nixos-26.05-small 0.4.5

Package maintainers