CVE-2026-47692CWE-130

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

Medium · published June 26, 2026

CVSS v3.1
4.8
EPSS
0%
Percentile
11.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.8 · MEDIUM
Vector
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00218 · 11.6th percentile
Weakness
CWE-130 · Improper Handling of Length Parameter Inconsistency
Published
2026-06-26T17:59Z
EPSS history
Timeline
  • 26 JUN 17:59Z
    Envoy: PROXY Protocol v2 header generator emits "skipped" TLVs, causing 65 KB attacker-controlled spillover into the upstream application stream
    cvelistv5