What is CVE-2026-26310?

CVE-2026-26310 is a medium-severity vulnerability in Envoyproxy Envoy, classified under Improper Input Validation. CVSS score: 5.9/10. Published 2026-03-10.

How severe is CVE-2026-26310?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Improper input validation in Envoyproxy Envoy

CVE-2026-26310

Envoy is a high-performance edge/middle/service proxy. Prior to 1.37.1, 1.36.5, 1.35.8, and 1.34.13, calling Utility::getAddressWithPort with a scoped IPv6 addresses causes a crash. This utility is called in the data plane from the origina…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.000 (0.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Envoyproxy Envoy — versions >= 1.37.0, < 1.37.1, >= 1.36.0, < 1.36.5, >= 1.35.0, < 1.35.9

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-3cw6-2j68-868p (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-26310?: CVE-2026-26310 is a medium-severity vulnerability in Envoyproxy Envoy, classified under Improper Input Validation. CVSS score: 5.9/10. Published 2026-03-10.
How severe is CVE-2026-26310?: Medium severity. CVSS v3 base score is 5.9 out of 10.