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CVE-2026-3012 Red Hat CVE debrief

A flaw was found in Samba’s certificate auto-enrollment Group Policy handling. When certificate auto-enrollment is enabled, Samba may retrieve a CA certificate over an unencrypted HTTP connection and install it into the local trust store without proper verification. An attacker with the ability to intercept or redirect network traffic could exploit this behavior to supply a malicious certificate authority certificate, potentially allowing interception or spoofing of trusted communications.

Vendor
Red Hat
Product
Red Hat Enterprise Linux 10
CVSS
HIGH 8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-27
Original CVE updated
2026-09-10
Advisory published
2026-05-27
Advisory updated
2026-09-10

Who should care

Users of Red Hat OpenShift Container Platform and Samba

Technical summary

The vulnerability exists in Samba's certificate auto-enrollment Group Policy handling. Specifically, when certificate auto-enrollment is enabled, Samba may retrieve a CA certificate over an unencrypted HTTP connection and install it into the local trust store without proper verification.

Defensive priority

HIGH

Recommended defensive actions

  • Apply patches or updates provided by Red Hat or Samba to address the vulnerability.
  • Ensure that certificate auto-enrollment is properly configured and validated.
  • Use secure communication protocols (e.g., HTTPS) for certificate retrieval.

Evidence notes

The vulnerability has been assigned a CVSS score of 8 and is considered HIGH severity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-3012 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-3012

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-3012 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-3012

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.