CVE-2026-27138

medium

Description

Certificate verification can panic when a certificate in the chain has an empty DNS name and another certificate in the chain has excluded name constraints. This can crash programs that are either directly verifying X.509 certificate chains, or those that use TLS.

References

https://pkg.go.dev/vuln/GO-2026-4600

https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk

https://go.dev/issue/77953

https://go.dev/cl/752183

Details

Source: Mitre, NVD

Published: 2026-03-06

Updated: 2026-03-10

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Severity: High

CVSS v3

Base Score: 5.9

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: Medium

EPSS

EPSS: 0.0002