Is CVE-2026-42012 actively exploited?

No active exploitation of CVE-2026-42012 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42012 be exploited remotely?

Yes. CVE-2026-42012 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42012?

CVE-2026-42012 has a CVSS score of 7.1 (HIGH).

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HIGH

CVE-2026-42012

CWE-295Published: May 26, 2026· Updated: Jun 2, 2026

7.1

CVSS v3.1

Official Description

A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.

NVD Source

Technical Analysis

CVE-2026-42012 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.1.