CVE-2026-4433: An SSH misconfigurations exists in Tenable OT that led to the potential exfiltration of socket, port, and serv

Routine

MEDIUM 4.3UPGRADE

CVE-2026-4433 is a medium-severity flaw (CVSS 4.3) affecting operational technology exposure. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An SSH misconfigurations exists in Tenable OT that led to the potential exfiltration of socket, port, and service information via the ostunnel user and GatewayPorts. This could be used to potentially glean information about the underlying system and give an attacker information that could be used to attempt to compromise the host.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 94%)
CISA exploited list	No
Weakness	CWE-16
Published	2026-03-24
Last modified	2026-08-18

Publisher (CNA): Tenable Network Security, Inc. · Vendor: tenable

Last updated 2026-08-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-24 21:16 UTCPublished CVE record published
2026-08-18 18:42 UTCUpdated Record last modified

tenable operational technology exposure UPGRADE

Affected: >= 3.18.58 and < 4.2.40

Fixed in: 4.2.40

Safe to downgrade to: a release before 3.18.58

1. Check installed version

apt-cache policy operational-technology-exposure || rpm -q operational-technology-exposure || operational-technology-exposure --version

2. UPGRADE to 4.2.40 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade operational-technology-exposure

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade operational-technology-exposure

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 3.18.58 (Debian / Ubuntu)

apt-cache madison operational-technology-exposure sudo apt install operational-technology-exposure=<VERSION_BEFORE_3.18.58> sudo apt-mark hold operational-technology-exposure

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

dnf --showduplicates list operational-technology-exposure sudo dnf downgrade operational-technology-exposure-<VERSION_BEFORE_3.18.58> sudo dnf versionlock add operational-technology-exposure

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-2026-4433?

operational technology exposure: upgrade to 4.2.40. Exact commands for each OS are on this page.

Is CVE-2026-4433 being exploited?

CVE-2026-4433 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-2026-4433 affect?

CVE-2026-4433 affects operational technology exposure. Severity is medium (CVSS 4.3). An SSH misconfigurations exists in Tenable OT that led to the potential exfiltration of socket, port, and service information via the ostunnel user and GatewayPorts. This could be used to potentially glean information about the underlying s

How urgent is CVE-2026-4433?

Priority 17/100. No elevated risk signals yet.

References

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