CVE-2026-88808: A vulnerability has been identified within Rancher Manager where the Fleet agent wrote resources to downstream

Routine

HIGH 8.8UPGRADE

CVE-2026-88808 is a high-severity flaw (CVSS 8.8) affecting rancher fleet. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability has been identified within Rancher Manager where the Fleet agent wrote resources to downstream clusters using its own cluster-admin credentials instead of the ServiceAccount pinned to the deployment. It affects multi-tenancy environments where different tenants share the same downstream clusters, for example different privileged or untrusted teams inside the same organization. This could lead to overwritten configuration files. T

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-250
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 16:17 UTCPublished CVE record published
2026-10-07 17:00 UTCUpdated Record last modified

suse rancher fleet UPGRADE

Affected: >= 0.14.0 and < 0.14.11 · >= 0.15.0 and < 0.15.7 · >= 0.16.0 and < 0.16.2

Fixed in: 0.14.11, 0.15.7, 0.16.2

Safe to downgrade to: a release before 0.14.0

1. Check installed version

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

2. UPGRADE to 0.14.11 (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 0.14.0 (Debian / Ubuntu)

apt-cache madison rancher-fleet sudo apt install rancher-fleet=<VERSION_BEFORE_0.14.0> 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_0.14.0> 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-2026-88808?

rancher fleet: upgrade to 0.14.11, 0.15.7, 0.16.2. Exact commands for each OS are on this page.

Is CVE-2026-88808 being exploited?

CVE-2026-88808 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-2026-88808 affect?

CVE-2026-88808 affects rancher fleet. Severity is high (CVSS 8.8). A vulnerability has been identified within Rancher Manager where the Fleet agent wrote resources to downstream clusters using its own cluster-admin credentials instead of the ServiceAccount pinned to the deployment. It affects multi-tenancy

How urgent is CVE-2026-88808?

Priority 36/100. High severity

Software pages

Rancher vulnerabilities

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References

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