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CVE-2026-27137

7.5 · HIGH

When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local portions but different domain portions, these constraints will…

Published Mar 6, 2026CWE-295EPSS 0.63%

Overview

CVE-2026-27137 is a high-severity vulnerability. It was published on March 6, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local portions but different domain portions, these constraints will not be properly applied, and only the last constraint will be considered.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgo.dev/cl/752182Refgo.dev/issue/77952Refgroups.google.com/g/golang-announce/c/EdhZqrQ98hkRefpkg.go.dev/vuln/GO-2026-4599Refaccess.redhat.com/errata/RHSA-2026:10125Refaccess.redhat.com/errata/RHSA-2026:10158Refaccess.redhat.com/errata/RHSA-2026:10169Refaccess.redhat.com/errata/RHSA-2026:10175Refaccess.redhat.com/errata/RHSA-2026:10184Refaccess.redhat.com/errata/RHSA-2026:10225

How CyberStrike helps

Frequently asked questions

What is CVE-2026-27137?

CVE-2026-27137 is a high-severity vulnerability. It was published on March 6, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-27137?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-27137?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-27137?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-27137 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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