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Untriaged
Permalink CVE-2026-47692
4.8 MEDIUM
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Adjacent (A)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): High (H)
  • User Interaction (UI): None (N)
  • Scope (S): Changed (C)
  • Confidentiality (C): None (N)
  • Integrity (I): Low (L)
  • Availability (A): Low (L)
  • Modified Attack Vector (MAV): Adjacent (A)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): High (H)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): None (N)
  • Modified Scope (MS): Changed (C)
  • Modified Integrity (MI): Low (L)
  • Modified Availability (MA): Low (L)
created 2 months ago Activity log
  • Created suggestion 2 months ago
Envoy: PROXY Protocol v2 header generator emits "skipped" TLVs, causing 65 KB attacker-controlled spillover into the upstream application stream

Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.34.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, PROXY Protocol v2 header generator emits TLVs beyond the maximum length of 65535 bytes, causing a mismatch between bytes written and the length field in the header. This can result in smuggled bytes on the upstream request. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.

Affected products

envoy
  • ==>= 1.37.0, < 1.37.5
  • ==>= 1.38.0, < 1.38.3
  • ==>= 1.34.0, < 1.35.13
  • ==>= 1.36.0, < 1.36.9

Matching in nixpkgs

pkgs.envoy

Cloud-native edge and service proxy

  • nixos-unstable -
  • nixos-26.05 -

pkgs.envoy-bin

Cloud-native edge and service proxy

  • nixos-unstable -
  • nixos-26.05 -