What’s Vulnerable › Vulnerabilities
CVE-2026-47692: Envoy: PROXY Protocol v2 header generator emits "skipped" TLVs, causing 65 KB attacker-controlled spillover into the upstream application stream
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-26 · updated 2026-10-25
- Weakness: CWE-130
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: from 1.34.0 before 1.35.13; from 1.36.0 before 1.36.9; from 1.37.0 before 1.37.5; from 1.38.0 before 1.38.3 — fixed in 1.35.13, 1.36.9, 1.37.5, 1.38.3
How to fix
Upgrade to a fixed version: envoyproxy envoy 1.35.13, 1.36.9, 1.37.5, 1.38.3. Check the vendor advisory for mitigations.
References
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