CVE-2026-83458: Vulnerability in the Helidon product of Oracle Fusion Middleware (component: JSON)

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-83458 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: JSON). Supported versions that are affected are 4.0.0-4.5.4. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Helidon. CVSS 3.1 Base Score 5.3 (Availability impacts). CVSS

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-400
Published	2026-09-15
Last modified	2026-09-28

Publisher (CNA): Oracle · Vendor: oracle

Last updated 2026-09-28 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-15 20:18 UTCPublished CVE record published
2026-09-28 15:20 UTCUpdated Record last modified

oracle helidon UPGRADE

Affected: >= 4.0.0 and <= 4.5.4

Fixed in: newer than 4.5.4

Safe to downgrade to: a release before 4.0.0

1. Check installed version

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

2. UPGRADE to newer than 4.5.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade helidon

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade helidon

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 4.0.0 (Debian / Ubuntu)

apt-cache madison helidon sudo apt install helidon=<VERSION_BEFORE_4.0.0> sudo apt-mark hold helidon

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list helidon sudo dnf downgrade helidon-<VERSION_BEFORE_4.0.0> 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.

Quick answers

How do I fix CVE-2026-83458?

helidon: upgrade to newer than 4.5.4. Exact commands for each OS are on this page.

Is CVE-2026-83458 being exploited?

CVE-2026-83458 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-83458 affect?

CVE-2026-83458 affects helidon. Severity is medium (CVSS 5.3). Vulnerability in the Helidon product of Oracle Fusion Middleware (component: JSON). Supported versions that are affected are 4.0.0-4.5.4. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to comp

How urgent is CVE-2026-83458?

Priority 32/100. Remotely exploitable, no login, no user action

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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