CVE-2026-27138

Aliases:GO-2026-4600BIT-golang-2026-27138
Advisory lineage Upstream: 0 Downstream: 13
Analyzed
Published: 06 Mar 2026, 21:28
Last modified:10 Mar 2026, 13:35

Vulnerability Summary

Overall Risk (default)
low
24/100
CVSS Score
5.9 MEDIUM
v3.1 (cve.org)
EPSS Score
0.03% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

06 Mar 2026, 21:28
Published
Vulnerability first disclosed
10 Mar 2026, 13:35
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.03%• Percentile: 9%

Techniques & Countermeasures

  • CWE-295•Improper Certificate Validation

    The product does not validate, or incorrectly validates, a certificate.

Affected Systems

  • go standard library•crypto/x509

    ≥ 1.26.0-0, < 1.26.1

  • golang•go

    1.26.0

  • Go•stdlib

    ≥ 1.26.0-0, < 1.26.1

References (4)