CVE-2026-44937: Potential forgery of webhook requests when using a unauthenticated webhook in SUSE Rancher Fleet 0.15 before 0

This month

HIGH 8.2REMOTEUPGRADE

CVE-2026-44937 is a high-severity flaw (CVSS 8.2) affecting rancher fleet. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Potential forgery of webhook requests when using a unauthenticated webhook in SUSE Rancher Fleet 0.15 before 0.15.2, 0.14 before 0.14.6, 0.13 before 0.13.11 and 0.12 before 0.12.5 could be used by remote attackers to cause a denial of service or a downgrade attack on other repositories on the system.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-07-06
Last modified	2026-10-25

Publisher (CNA): SUSE · Vendor: suse

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-06 11:16 UTCPublished CVE record published
2026-10-25 15:10 UTCUpdated Record last modified

suse rancher fleet UPGRADE

Affected: >= 0.12.0 and < 0.12.15 · >= 0.13.0 and < 0.13.11 · >= 0.14.0 and < 0.14.6 · >= 0.15.0 and < 0.15.2

Fixed in: 0.12.15, 0.13.11, 0.14.6, 0.15.2

Safe to downgrade to: a release before 0.12.0

1. Check installed version

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

2. UPGRADE to 0.12.15 (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 0.12.0 (Debian / Ubuntu)

apt-cache madison rancher-fleet sudo apt install rancher-fleet=<VERSION_BEFORE_0.12.0> 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_0.12.0> 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-2026-44937?

rancher fleet: upgrade to 0.12.15, 0.13.11, 0.14.6, 0.15.2. Exact commands for each OS are on this page.

Is CVE-2026-44937 being exploited?

CVE-2026-44937 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-2026-44937 affect?

CVE-2026-44937 affects rancher fleet. Severity is high (CVSS 8.2). Potential forgery of webhook requests when using a unauthenticated webhook in SUSE Rancher Fleet 0.15 before 0.15.2, 0.14 before 0.14.6, 0.13 before 0.13.11 and 0.12 before 0.12.5 could be used by remote attackers to cause a denial of servi

How urgent is CVE-2026-44937?

Priority 43/100. High severity; Remotely exploitable, no login, no user action

Software pages

Rancher vulnerabilities

Related CVEs

CVE-2026-44936 MEDIUM 5.0 UPGRADE Missing filtering when the helmRepoURLRegex field isn't set on a GitRepo resource in SUSE Rancher Fleet's bund

References

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