CVE-2026-93540: A privilege mismatch was found in Fleet

Routine

MEDIUM 6.5UPGRADE

CVE-2026-93540 is a medium-severity flaw (CVSS 6.5) affecting rancher fleet. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A privilege mismatch was found in Fleet. When a bundle requested namespace labels or annotations through the namespaceLabels and namespaceAnnotations options, the resulting namespace metadata update was not subject to the same authorization as the rest of the bundle's deployment. As a result, a bundle could change labels and annotations on a target namespace even when the identity it was pinned to was not authorized to modify that namespace. Thi

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-266
Published	2026-09-28
Last modified	2026-10-07

Publisher (CNA): SUSE · Vendor: suse

Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-28 15:17 UTCPublished CVE record published
2026-10-07 17:03 UTCUpdated Record last modified

suse rancher fleet UPGRADE

Affected: >= 0.13.0 and < 0.13.16 · >= 0.14.0 and < 0.14.11 · >= 0.15.0 and < 0.15.7 · >= 0.16.0 and < 0.16.1

Fixed in: 0.13.16, 0.14.11, 0.15.7, 0.16.1

Safe to downgrade to: a release before 0.13.0

1. Check installed version

apt-cache policy rancher-fleet || rpm -q rancher-fleet || rancher-fleet --version

2. UPGRADE to 0.13.16 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade rancher-fleet

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade rancher-fleet

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 0.13.0 (Debian / Ubuntu)

apt-cache madison rancher-fleet sudo apt install rancher-fleet=<VERSION_BEFORE_0.13.0> sudo apt-mark hold rancher-fleet

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

dnf --showduplicates list rancher-fleet sudo dnf downgrade rancher-fleet-<VERSION_BEFORE_0.13.0> sudo dnf versionlock add rancher-fleet

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-2026-93540?

rancher fleet: upgrade to 0.13.16, 0.14.11, 0.15.7, 0.16.1. Exact commands for each OS are on this page.

Is CVE-2026-93540 being exploited?

CVE-2026-93540 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-2026-93540 affect?

CVE-2026-93540 affects rancher fleet. Severity is medium (CVSS 6.5). A privilege mismatch was found in Fleet. When a bundle requested namespace labels or annotations through the namespaceLabels and namespaceAnnotations options, the resulting namespace metadata update was not subject to the same authorization

How urgent is CVE-2026-93540?

Priority 24/100. No elevated risk signals yet.

Software pages

Rancher vulnerabilities

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References

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