Affects Oracle Database Portable Clusterware, a widely deployed enterprise component; allows unauthenticated takeover (CVSS 9.6) with potential enterprise DB disruption.
CVE-2026-71064
Unauthenticated takeover of Oracle Portable Clusterware via network-adjacent access
Is CVE-2026-71064 being exploited?
Not confirmed. CVE-2026-71064 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-2026-71064?
CVE-2026-71064 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-2026-71064?
Yes. A fix has been recorded for CVE-2026-71064. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-71064 affect?
CVE-2026-71064 affects Oracle Database Server - Portable Clusterware (19.3-19.32), Oracle Database Server - Portable Clusterware (21.3-21.23), Oracle Database Server - Portable Clusterware (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-2026-71064?
Isolate cluster comms, restrict access, apply vendor patch when available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Network-adjacent unauthenticated compromise of Portable Clusterware enabling full takeover of cluster and potential compromise of Oracle DBs (C/I/A: high).
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.