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CVE-2026-91664: Vulnerability in Oracle Essbase (component: Security)

36
Routine
HIGH 7.5REMOTEDOWNGRADE

CVE-2026-91664 is a high-severity flaw (CVSS 7.5) affecting essbase. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Vulnerability in Oracle Essbase (component: Security). The supported version that is affected is 21.8.3.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via TCP to compromise Oracle Essbase. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Essbase. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vect

Why this priority

  • High severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.3% (top 81%)
CISA exploited listNo
WeaknessCWE-400
Published2026-10-20
Last modified2026-10-23
Publisher (CNA): Oracle · Vendor: oracle

Am I affected?

Timeline

oracle essbase DOWNGRADE
Affected: 21.8.3.0.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 21.8.3.0.0
1. Check installed version
apt-cache policy essbase || rpm -q essbase || essbase --version
2. No fixed release: DOWNGRADE to a release before 21.8.3.0.0 (Debian / Ubuntu)
apt-cache madison essbase sudo apt install essbase=<VERSION_BEFORE_21.8.3.0.0> sudo apt-mark hold essbase
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list essbase sudo dnf downgrade essbase-<VERSION_BEFORE_21.8.3.0.0> sudo dnf versionlock add essbase
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

A distro patch exists: prefer upgrading over downgrading.
Fedora 46 · wasmedge · FIXED · 0.18.1-1.fc46 · FEDORA-2026-4c27216e39 · source
sudo dnf upgrade --advisory=FEDORA-2026-4c27216e39
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.

Related CVEs

References

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