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CVE-2026-71064 Oracle CVE debrief

The Portable Clusterware component of Oracle Database Server contains a vulnerability that allows an unauthenticated attacker with access to the physical communication segment to compromise the server. This vulnerability affects Oracle Database Server versions 19.3-19.32, 21.3-21.23, and 23.4.0-23.26.3. The vulnerability has a CVSS 3.1 Base Score of 9.6, indicating a critical severity level. Successful attacks can result in the takeover of Portable Clusterware. Evidence is limited to CVE and NVD details. Defenders should verify affected versions, apply patches, and monitor for suspicious activity. The CVE record was published on 2026-08-18T21:18:06.313Z and has not been modified since then. Additional context from vendor advisories and official CVE records should be reviewed for comprehensive understanding and mitigation strategies.

Vendor
Oracle
Product
Database Server
CVSS
CRITICAL 9.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-18
Original CVE updated
2026-08-22
Advisory published
2026-08-18
Advisory updated
2026-08-22

Who should care

Oracle Database Server administrators and users; verify and apply patches to prevent potential takeover of Portable Clusterware. Affected operators should review and apply vendor guidance. Vulnerability management and security teams should monitor for exposed assets and plan for remediation.

Technical summary

The vulnerability in Portable Clusterware allows an unauthenticated attacker with access to the physical communication segment to compromise Portable Clusterware. It affects Oracle Database Server versions 19.3-19.32, 21.3-21.23, and 23.4.0-23.26.3. The CVSS 3.1 Base Score is 9.6, indicating a critical severity level. Successful attacks can result in the takeover of Portable Clusterware. Defenders should verify affected versions, apply patches, and monitor for suspicious activity. Review compensating controls for exposed systems while remediation is scheduled and verified. Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Defensive priority

Oracle Database Server Portable Clusterware vulnerability allows unauthenticated attackers to compromise the server; verify and apply vendor patches.

Recommended defensive actions

  • Verify Oracle Database Server version and apply patches
  • Restrict access to the physical communication segment
  • Monitor for suspicious activity
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability affects Oracle Database Server versions 19.3-19.32, 21.3-21.23, and 23.4.0-23.26.3. Verify affected versions and apply patches. The Portable Clusterware component is vulnerable, allowing unauthenticated attackers with access to the physical communication segment to compromise the server. Evidence is limited to CVE and NVD details. Defenders should verify affected versions, apply patches, and monitor for suspicious activity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-71064 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-71064

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

  • CVE-2026-71064 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-71064

    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.