Vulnerability in Envoyproxy Envoy

CVE-2026-47692

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L.

EPSS exploit prediction

EPSS: 0.002 (11.0th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 11.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-47692: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

  • Envoyproxy Envoy — versions >= 1.38.0, < 1.38.3, >= 1.37.0, < 1.37.5, >= 1.36.0, < 1.36.9

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-47692?
CVE-2026-47692 is a medium-severity vulnerability in Envoyproxy Envoy, classified under Improper Handling of Length Parameter Inconsistency. CVSS score: 4.8/10. Published 2026-06-26.
How severe is CVE-2026-47692?
Medium severity. CVSS v3 base score is 4.8 out of 10.