CVE-2026-47692

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.

At a glance

Exploitability

Can be exploited from the same network segment with an admin-level account. Limited direct impact.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-06-26 18:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-25 17:10 UTC Last updatedMost recent change to the record

Details

Published

2026-06-26 18:16 UTC

Last modified

2026-10-25 17:10 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-130

Record status

Analyzed

Affected

• Envoyproxy Envoy < 1.35.13
• Envoyproxy Envoy < 1.36.9
• Envoyproxy Envoy < 1.37.5
• Envoyproxy Envoy < 1.38.3

Attack profile CVSS 3.1 · 4.8

Attack vector

Adjacent network

Complexity

Low

Privileges needed

High

User interaction

None

Scope

Changed

Confidentiality

None

Integrity

Low

Availability

Low