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CVE PROGRAM SOURCE RECORD4.8 Medium

CVE-2026-47692

Envoy: PROXY Protocol v2 header generator emits "skipped" TLVs, causing 65 KB attacker-controlled spillover into the upstream application stream

Description

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

envoyproxy envoy

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

References