CVE-2026-71156: Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server)

Routine

MEDIUM 5.3REMOTEDOWNGRADE

CVE-2026-71156 is a medium-severity flaw (CVSS 5.3) 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 3.0.0-3.2.18. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Helidon accessible data. CVSS 3.1 Base Score 5.3 (Integrity imp

Why this priority

Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-284
Published	2026-08-18
Last modified	2026-10-22

Publisher (CNA): Oracle · Vendor: oracle

Am I affected?

Timeline

2026-08-18Published CVE record published
2026-10-22 17:09 UTCUpdated Record last modified

oracle helidon DOWNGRADE

Affected: 3.2.19

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2.19

1. Check installed version

apt-cache policy helidon || rpm -q helidon || helidon --version

2. No fixed release: DOWNGRADE to a release before 3.2.19 (Debian / Ubuntu)

apt-cache madison helidon sudo apt install helidon=<VERSION_BEFORE_3.2.19> sudo apt-mark hold helidon

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list helidon sudo dnf downgrade helidon-<VERSION_BEFORE_3.2.19> 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.

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

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)

References

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