Affects Oracle Database Portable Clusterware across multiple supported versions; high-severity (CVSS 9.6) takeover risk of widely deployed enterprise DB infrastructure.
CVE-2026-71063
Critical Oracle Portable Clusterware takeover via adjacent-network access.
Is CVE-2026-71063 being exploited?
Not confirmed. CVE-2026-71063 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.34% probability of exploitation in the next 30 days.
How severe is CVE-2026-71063?
CVE-2026-71063 is rated Critical with a CVSS score of 9.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-71063?
Yes. A fix has been recorded for CVE-2026-71063. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-71063 affect?
CVE-2026-71063 affects Oracle Database Server Portable Clusterware, Versions: 19.3-19.32, Versions: 21.3-21.23, Versions: 23.4.0-23.26.3. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-71063?
Isolate clusterware network, block access to clusterware interfaces, apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated adjacent-network attacker can take over Portable Clusterware, enabling full cluster compromise, data exfiltration and service disruption.
Immediate action required
- affected>= 19.3 and <= 19.32
- affected>= 21.3 and <= 21.23
- affected>= 23.4.0 and <= 23.26.3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.