CVE-2026-27138

MEDIUM
2026-03-06 [email protected]
5.9
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Patch Released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 22:06 vuln.today
CVE Published
Mar 06, 2026 - 22:16 nvd
MEDIUM 5.9

Tags

Dns Denial Of Service Redhat Suse

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.

Analysis

DNS certificate verification can crash in systems handling X.509 certificate chains when processing certificates with empty DNS names paired with excluded name constraints, affecting applications performing direct certificate validation or using TLS. This denial of service condition requires no authentication or user interaction but depends on specific certificate chain configurations. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

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Priority Score

30
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +30
POC: 0

Vendor Status

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CVE-2026-27138 vulnerability details – vuln.today
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