CVE-2026-27138

Name: CVE-2026-27138
Creator: NVD / NIST
Published: 2026-03-06T22:16:00.963+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 0.35%

Last modified Jun 17, 2026

CVE-2026-27138 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. 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.. EPSS estimates a 0.35% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.9/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.35%

26.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-295

Affected Software

Vendor	Product	Versions
Golang	Go	1.26.0

References

https://go.dev/cl/752183Mailing List
https://go.dev/issue/77953Issue Tracking
https://groups.google.com/g/golang-announce/c/EdhZqrQ98hkRelease Notes
https://pkg.go.dev/vuln/GO-2026-4600Vendor Advisory

Timeline

Published: Mar 6, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-27138?

How severe is CVE-2026-27138?

CVE-2026-27138 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 0.35% probability of exploitation in the next 30 days.

How do I fix CVE-2026-27138?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-27138?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST