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Untriaged
Permalink CVE-2026-55677
7.5 HIGH
  • 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): High (H)
  • Integrity (I): None (N)
  • Availability (A): None (N)
  • 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): High (H)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): None (N)
  • Modified Availability (MA): None (N)
created 1 month ago Activity log
  • Created suggestion 1 month ago
Echo: Encoded slash (%2F) bypasses route-level protection and exposes static files

Echo is a Go web framework. Prior to 4.15.3 and 5.2.0, Echo's router and static file handler disagree on URL path decoding. The router matches routes using the raw encoded path (preserving %2F as-is), while StaticDirectoryHandler unescapes %2F to / before resolving filesystem paths. This allows an attacker to bypass route-level access controls and read static files without authorization. This vulnerability is fixed in 4.15.3 and 5.2.0.

Affected products

echo
  • ==>= 5.0.0, < 5.2.0
  • ==< 4.15.3

Matching in nixpkgs

pkgs.vkdevicechooser

Vulkan layer to force a specific device to be used

  • nixos-unstable 1.1
    • nixpkgs-unstable 1.1
    • nixos-unstable-small 1.1
  • nixos-26.05 1.1
    • nixos-26.05-small 1.1
    • nixpkgs-26.05-darwin 1.1

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