CVE-2026-27138
Received Received - Intake
Certificate Verification Panic in Go TLS Causes Program Crashes

Publication date: 2026-03-06

Last updated on: 2026-04-21

Assigner: Go Project

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.
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Meta Information
Published
2026-03-06
Last Modified
2026-04-21
Generated
2026-06-16
AI Q&A
2026-03-07
EPSS Evaluated
2026-06-15
NVD
CVE-2026-27138
EUVD
EUVD-2026-10086
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
golang go 1.26.0
Helpful Resources
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 during certificate verification when a certificate chain includes a certificate with an empty DNS name and another certificate with excluded name constraints. This situation can cause the verification process to panic, leading to a crash in programs that verify X.509 certificate chains or use TLS.

Impact Analysis

The vulnerability can cause programs that verify X.509 certificate chains or use TLS to crash unexpectedly. This can lead to denial of service or interruption of secure communications, potentially affecting the availability and reliability of applications relying on certificate verification.

Compliance Impact

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Detection Guidance

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Mitigation Strategies

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