CVE-2026-27138: Panic in name constraint checking for malformed certificates in crypto/x509
Go standard library · crypto/x509
Vendor fix available · Affected: Go standard library crypto/x509 · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 32% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Go standard library · crypto/x509from 1.26.0-0 before 1.26.1
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Weakness
- Improper Validation of Specified Index, Position, or Offset in Input · Input Validation and Logic
- Vendor
- Go standard library
- Published
- March 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-27138 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.