Vulnerability in Envoyproxy Envoy

CVE-2026-48743

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.35.11, 1.36.7, 1.37.3, and 1.38.1, Envoy can translate a downstream HTTP/3 request that is complete at the transport layer (HEADERS with FIN…

Vulnerability class: HTTP Request Smuggling

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N.

Affected products

  • Envoyproxy Envoy — versions >= 1.38.0, < 1.38.1, >= 1.37.0, < 1.37.3, >= 1.36.0, < 1.36.7

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-48743?
CVE-2026-48743 is a high-severity vulnerability in Envoyproxy Envoy, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.5/10. Published 2026-06-26.
How severe is CVE-2026-48743?
High severity. CVSS v3 base score is 7.5 out of 10.