PatchTheCVECVE-2026-71063: Vulnerability in the Portable Clusterware component of Oracle Database Server
42
This month
CRITICAL 9.6UPGRADE
CVE-2026-71063 is a critical-severity flaw (CVSS 9.6) affecting database server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Vulnerability in the Portable Clusterware component of Oracle Database Server. Supported versions that are affected are 19.3-19.32, 21.3-21.23 and 23.4.0-23.26.3. Easily exploitable vulnerability allows unauthenticated attacker with access to the physical communication segment attached to the hardware where the Portable Clusterware executes to compromise Portable Clusterware. While the vulnerability is in Portable Clusterware, attacks may sign
Why this priority
- Critical severity
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.6 (Critical) |
| Attack vector | Adjacent network |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 67%) |
| CISA exploited list | No |
| Weakness | CWE-284 |
| Published | 2026-08-18 |
| Last modified | 2026-10-22 |
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
oracle database server UPGRADE
Affected: >= 19.3 and <= 19.32 · >= 21.3 and <= 21.23 · >= 23.4.0 and <= 23.26.3
Fixed in: newer than 23.26.3
Safe to downgrade to: a release before 19.3
1. Check installed version
apt-cache policy database-server || rpm -q database-server || database-server --version
2. UPGRADE to newer than 23.26.3 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade database-server
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade database-server
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 19.3 (Debian / Ubuntu)
apt-cache madison database-server
sudo apt install database-server=<VERSION_BEFORE_19.3>
sudo apt-mark hold database-server
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list database-server
sudo dnf downgrade database-server-<VERSION_BEFORE_19.3>
sudo dnf versionlock add database-server
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Exact fixes by distribution
Fedora 46 · retext · FIXED · 8.1.0-1.fc46 · FEDORA-2026-0602a84203 · source
sudo dnf upgrade --advisory=FEDORA-2026-0602a84203
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Related CVEs
- CVE-2026-71102 CRITICAL 9.1 UPGRADE Vulnerability in the Portable Clusterware component of Oracle Database Server
- CVE-2026-71064 CRITICAL 9.6 UPGRADE Vulnerability in the Portable Clusterware component of Oracle Database Server
- CVE-2026-71062 HIGH 8.5 UPGRADE Vulnerability in the RDBMS component of Oracle Database Server
- CVE-2026-71100 MEDIUM 5.3 UPGRADE Vulnerability in the RDBMS component of Oracle Database Server