CVE-2026-47692
Envoy: PROXY Protocol v2 header generator emits "skipped" TLVs, causing 65 KB attacker-controlled spillover into the upstream application stream
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.
INFO
Published Date :
June 26, 2026, 5:59 p.m.
Last Modified :
June 26, 2026, 5:59 p.m.
Remotely Exploit :
No
Source :
GitHub_M
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Update Envoy to version 1.35.13 or later.
- Update Envoy to version 1.36.9 or later.
- Update Envoy to version 1.37.5 or later.
- Update Envoy to version 1.38.3 or later.
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