CVE-2026-47692
Envoy: PROXY Protocol v2 header generator emits "skipped" TLVs, causing 65 KB attacker-controlled spillover into the upstream application stream
MEDIUM 4.8
At a glance
- Source
- NVD
- EPSS
- EPSS 0.22 % · percentile 12 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Analyzed
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.
Weaknesses (CWE)
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 4.8 | CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L | GitHub_M |
| CVSS 3.1 | MEDIUM 4.8 | CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L | NVD · security-advisories@github.com (Secondary) |
| CVSS 3.1 | MEDIUM 4.3 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2026-39827
- GCVE · GCVE-0-2026-47692
Affected configurations (NVD CPE)
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*≥ 1.34.0 < 1.35.13cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*≥ 1.36.0 < 1.36.9cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*≥ 1.37.0 < 1.37.5cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*≥ 1.38.0 < 1.38.3
Affected products
| Product | Versions |
|---|---|
| envoyproxy · envoy | affected >= 1.38.0, < 1.38.3 ; affected >= 1.37.0, < 1.37.5 ; affected >= 1.36.0, < 1.36.9 ; affected >= 1.34.0, < 1.35.13 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |