PatchTheCVECVE-2026-73878: Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server)
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HIGH 7.5REMOTEDOWNGRADE
CVE-2026-73878 is a high-severity flaw (CVSS 7.5) affecting helidon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). Supported versions that are affected are 3.0.0-3.2.17. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Helidon accessible data. CVSS 3.1 Base Score 7.5 (Confid
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 63%) |
| CISA exploited list | No |
| Weakness | CWE-200 |
| Published | 2026-08-18 |
| Last modified | 2026-10-22 |
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
oracle helidon DOWNGRADE
Affected: 3.2.18
Fixed in: no fixed release known
Safe to downgrade to: a release before 3.2.18
1. Check installed version
apt-cache policy helidon || rpm -q helidon || helidon --version
2. No fixed release: DOWNGRADE to a release before 3.2.18 (Debian / Ubuntu)
apt-cache madison helidon
sudo apt install helidon=<VERSION_BEFORE_3.2.18>
sudo apt-mark hold helidon
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list helidon
sudo dnf downgrade helidon-<VERSION_BEFORE_3.2.18>
sudo dnf versionlock add helidon
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 · 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-2026-60853 LOW 3.7 DOWNGRADE Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server)
- CVE-2026-60915 HIGH 7.4 DOWNGRADE Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server)
- CVE-2026-71074 CRITICAL 9.8 DOWNGRADE Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server)
- CVE-2026-71152 CRITICAL 9.8 DOWNGRADE Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server)
- CVE-2026-71164 CRITICAL 9.8 DOWNGRADE Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server)