# CVE-2026-47692

## Summary

- **CVE ID:** CVE-2026-47692
- **Severity:** MEDIUM
- **CVSS Score:** 4.8 (CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L)
- **CWE:** CWE-130
- **Published:** Jun 26, 2026
- **Last Modified:** Jun 26, 2026

## 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

- envoyproxy — envoy (>= 1.38.0, < 1.38.3)
- envoyproxy — envoy (>= 1.37.0, < 1.37.5)
- envoyproxy — envoy (>= 1.36.0, < 1.36.9)
- envoyproxy — envoy (>= 1.34.0, < 1.35.13)

## References

- [CNA](https://github.com/envoyproxy/envoy/security/advisories/GHSA-wh36-hm39-mm3r)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.22%
- **EPSS Percentile:** 12.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._