CVE-2026-29954: In KubePlus 4.1.4, the mutating webhook and kubeconfiggenerator components have an SSRF vulnerability when pro

Routine

HIGH 7.6DOWNGRADE

CVE-2026-29954 is a high-severity flaw (CVSS 7.6) affecting kubeplus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In KubePlus 4.1.4, the mutating webhook and kubeconfiggenerator components have an SSRF vulnerability when processing the chartURL field of ResourceComposition resources. The field is only URL-encoded without validating the target address. More critically, when kubeconfiggenerator uses wget to download charts, the chartURL is directly concatenated into the command, allowing attackers to inject wget's `--header` option to achieve arbitrary HTTP he

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-88, CWE-918
Published	2026-03-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: cloudark

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-30 17:16 UTCPublished CVE record published
2026-06-17 10:29 UTCUpdated Record last modified

cloudark kubeplus DOWNGRADE

Affected: 4.1.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.1.4

1. Check installed version

apt-cache policy kubeplus || rpm -q kubeplus || kubeplus --version

2. No fixed release: DOWNGRADE to a release before 4.1.4 (Debian / Ubuntu)

apt-cache madison kubeplus sudo apt install kubeplus=<VERSION_BEFORE_4.1.4> sudo apt-mark hold kubeplus

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list kubeplus sudo dnf downgrade kubeplus-<VERSION_BEFORE_4.1.4> sudo dnf versionlock add kubeplus

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-2026-29954?

kubeplus: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-29954 being exploited?

CVE-2026-29954 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-2026-29954 affect?

CVE-2026-29954 affects kubeplus. Severity is high (CVSS 7.6). In KubePlus 4.1.4, the mutating webhook and kubeconfiggenerator components have an SSRF vulnerability when processing the chartURL field of ResourceComposition resources. The field is only URL-encoded without validating the target address.

How urgent is CVE-2026-29954?

Priority 37/100. High severity; Public exploit reference

Related CVEs

CVE-2026-29955 HIGH 8.8 UPGRADE The `/registercrd` endpoint in KubePlus 4.14 in the kubeconfiggenerator component is vulnerable to command inj

References

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