CVE-2025-0426 — kubernetes
MEDIUMCVE-2025-0426 is a medium-severity (CVSS 6.2) Uncontrolled Resource Consumption vulnerability in k8s.io/kubernetes. A fix is available for k8s.io/kubernetes — see the affected versions and patch details below.
Node Denial of Service via kubelet Checkpoint API
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2025-0426.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
k8s.io/kubernetes🐹k8s.io/kubernetes🐹k8s.io/kubernetes🐹k8s.io/kubernetesReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
A security issue was discovered in Kubernetes where a large number of container checkpoint requests made to the unauthenticated kubelet read-only HTTP endpoint may cause a Node Denial of Service by filling the Node's disk.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | k8s.io/kubernetes | ≥ 1.32.0&&< 1.32.2 | 1.32.2go get k8s.io/kubernetes@v1.32.2 |
| 🐹Go | k8s.io/kubernetes | ≥ 1.31.0&&< 1.31.6 | 1.31.6go get k8s.io/kubernetes@v1.31.6 |
| 🐹Go | k8s.io/kubernetes | ≥ 1.30.0&&< 1.30.10 | 1.30.10go get k8s.io/kubernetes@v1.30.10 |
| 🐹Go | k8s.io/kubernetes | all versions | 1.29.14go get k8s.io/kubernetes@v1.29.14 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for k8s.io/kubernetes, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update k8s.io/kubernetes to 1.32.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-0426 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
OpenShift is not impacted by this vulnerability since the kubelet's unauthenticated read-only port is not enabled in that product.
To mitigate this vulnerability, disable the kubelet read-only port by setting `readOnlyPort: 0` in `/var/lib/kubelet/config.yaml` and restarting kubelet. Additionally, disable container checkpointing by setting `ContainerCheckpoint: false` under featureGates. If using CRI-O, ensure `enable_criu_support=false` is configured in `/etc/crio/crio.conf`.Source: Red Hat security advisory for CVE-2025-0426 (CC BY 4.0)
| Product | Fixed in | Advisory |
|---|---|---|
| RHODF-4.17-RHEL-9 | odf4/cephcsi-rhel9:v4.17.5-2 | RHSA-2025:1824 |
| RHODF-4.18-RHEL-9 | odf4/cephcsi-rhel9:v4.18.0-54 | RHSA-2025:2652 |
Frequently Asked Questions
Is CVE-2025-0426 in your dependencies?
Find it across Go, including transitive dependencies.