CVE-2026-27137
Modified Modified - Updated After Analysis

Certificate Chain Verification Flaw in Go Causes Constraint Bypass

Publication date: 2026-03-06

Last updated on: 2026-07-02

Assigner: Go Project

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.

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Meta Information

Published
2026-03-06
Last Modified
2026-07-02
Generated
2026-07-07
AI Q&A
2026-03-07
EPSS Evaluated
2026-07-05
NVD
CVE-2026-27137
EUVD
EUVD-2026-10085

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
golang go 1.26.0

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-295 The product does not validate, or incorrectly validates, a certificate.

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Executive Summary

This vulnerability occurs when verifying a certificate chain that includes a certificate with multiple email address constraints. If these constraints share the same local part of the email address but have different domain parts, the verification process does not apply all constraints correctly and only considers the last constraint.

Impact Analysis

Because the verification process ignores all but the last email address constraint in certain certificates, it may allow certificates that should be restricted by earlier constraints to be accepted. This could lead to improper validation of certificates, potentially allowing unauthorized entities to be trusted.

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