CVE-2026-19766: An authentication bypass vulnerability exists in the underlying operating system of HPE Networking Fabric Comp

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CRITICAL 9.6UPGRADE

CVE-2026-19766 is a critical-severity flaw (CVSS 9.6) affecting fabric composer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An authentication bypass vulnerability exists in the underlying operating system of HPE Networking Fabric Composer. Successful exploitation could allow an unauthenticated adjacent attacker to execute arbitrary code as a privileged user on the underlying operating system, leading to complete compromise of the AFC host.

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-287
Published	2026-09-01
Last modified	2026-09-04

Publisher (CNA): Hewlett Packard Enterprise (HPE) · Vendor: arubanetworks

Last updated 2026-09-04 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-01 20:17 UTCPublished CVE record published
2026-09-04 20:06 UTCUpdated Record last modified

arubanetworks fabric composer UPGRADE

Affected: >= 7.0.0 and <= 7.3.3

Fixed in: newer than 7.3.3

Safe to downgrade to: a release before 7.0.0

1. Check installed version

apt-cache policy fabric-composer || rpm -q fabric-composer || fabric-composer --version

2. UPGRADE to newer than 7.3.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fabric-composer

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fabric-composer

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 7.0.0 (Debian / Ubuntu)

apt-cache madison fabric-composer sudo apt install fabric-composer=<VERSION_BEFORE_7.0.0> sudo apt-mark hold fabric-composer

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

dnf --showduplicates list fabric-composer sudo dnf downgrade fabric-composer-<VERSION_BEFORE_7.0.0> sudo dnf versionlock add fabric-composer

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-2026-19766?

fabric composer: upgrade to newer than 7.3.3. Exact commands for each OS are on this page.

Is CVE-2026-19766 being exploited?

CVE-2026-19766 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-2026-19766 affect?

CVE-2026-19766 affects fabric composer. Severity is critical (CVSS 9.6). An authentication bypass vulnerability exists in the underlying operating system of HPE Networking Fabric Composer. Successful exploitation could allow an unauthenticated adjacent attacker to execute arbitrary code as a privileged user on t

How urgent is CVE-2026-19766?

Priority 42/100. Critical severity

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References

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