CVE-2026-93539: A vulnerability was discovered in Fleet's Git webhook receiver (the gitjob webhook service)

Routine

MEDIUM 5.4UPGRADE

CVE-2026-93539 is a medium-severity flaw (CVSS 5.4) affecting rancher fleet. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was discovered in Fleet's Git webhook receiver (the gitjob webhook service). When a webhook secret is not configured, incoming webhook requests are accepted without verification, and processing a request can change the spec.pollingInterval field of a matching GitRepo resource in any namespace. A caller with network access to the webhook service and no Kubernetes credentials can therefore alter GitRepo configuration outside the na

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-306
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 17:08 UTCUpdated Record last modified

suse rancher fleet UPGRADE

Affected: >= 0.16.0 and < 0.16.2

Fixed in: 0.16.2

Safe to downgrade to: a release before 0.16.0

1. Check installed version

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

2. UPGRADE to 0.16.2 (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 0.16.0 (Debian / Ubuntu)

apt-cache madison rancher-fleet sudo apt install rancher-fleet=<VERSION_BEFORE_0.16.0> 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_0.16.0> 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-2026-93539?

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

Is CVE-2026-93539 being exploited?

CVE-2026-93539 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-2026-93539 affect?

CVE-2026-93539 affects rancher fleet. Severity is medium (CVSS 5.4). A vulnerability was discovered in Fleet's Git webhook receiver (the gitjob webhook service). When a webhook secret is not configured, incoming webhook requests are accepted without verification, and processing a request can change the spec.

How urgent is CVE-2026-93539?

Priority 22/100. No elevated risk signals yet.

Software pages

Kubernetes vulnerabilities · Git vulnerabilities · Rancher vulnerabilities

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References

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