CVE-2026-47692 (GCVE-0-2026-47692)

Vulnerability from cvelistv5 – Published: 2026-06-26 17:59 – Updated: 2026-06-26 19:07
VLAI
Title
Envoy: PROXY Protocol v2 header generator emits "skipped" TLVs, causing 65 KB attacker-controlled spillover into the upstream application stream
Summary
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.
Severity
4.8 (Medium)
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-26 19:07 UTC
CWE
  • CWE-130 - Improper Handling of Length Parameter Inconsistency
Assigner
References
Impacted products
Vendor Product Version CPE status
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
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