CVE-2026-47692
Published:June 26, 2026
Updated:June 29, 2026
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 Packages
github.com/envoyproxy/envoy (GO):
Affected version(s) >=v1.36.0 <v1.36.9Fix Suggestion:
Update to version v1.36.9github.com/envoyproxy/envoy (GO):
Affected version(s) >=v1.38.0 <v1.38.3Fix Suggestion:
Update to version v1.38.3github.com/envoyproxy/envoy (GO):
Affected version(s) >=v1.37.0 <v1.37.5Fix Suggestion:
Update to version v1.37.5github.com/envoyproxy/envoy (GO):
Affected version(s) >=v1.34.0 <v1.35.13Fix Suggestion:
Update to version v1.35.13Related Resources (1)
Do you need more information?
Contact UsCVSS v4
Base Score:
4.8
Attack Vector
ADJACENT
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
LOW
Subsequent System Availability
LOW
CVSS v3
Base Score:
4.8
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
LOW
Weakness Type (CWE)
Improper Handling of Length Parameter Inconsistency
EPSS
Base Score:
0.22