What is CVE-2026-47778?

CVE-2026-47778 is a medium-severity vulnerability in Envoyproxy Envoy, classified under CWE-158. CVSS score: 4.4/10. Published 2026-06-26.

How severe is CVE-2026-47778?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Vulnerability in Envoyproxy Envoy

CVE-2026-47778

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, a structural flaw was identified in DefaultCertValidator::verifySubjectAltName where the extracted DNS SAN…

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/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)

CWE-158

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-47778?: CVE-2026-47778 is a medium-severity vulnerability in Envoyproxy Envoy, classified under CWE-158. CVSS score: 4.4/10. Published 2026-06-26.
How severe is CVE-2026-47778?: Medium severity. CVSS v3 base score is 4.4 out of 10.