CVE-2026-27138

MEDIUM

Go standard library crypto/x509 1.26.0 - Denial of Service via Empty DNS Name in Certificate Chain

Title source: llm
STIX 2.1

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 (4)

Core 4

Scores

CVSS v3 5.9
EPSS 0.0035
EPSS Percentile 26.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-295
Status published
Products (2)
Go standard library/crypto/x509 1.26.0-0 - 1.26.1
golang/go 1.26.0
Published Mar 06, 2026
Tracked Since Mar 07, 2026