CVE-2019-11255
MEDIUMKubernetes CSI Sidecar Containers Can Allow Unauthorized Data Access
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Blast Radius
github.com/kubernetes-csi/external-provisioner🐹github.com/kubernetes-csi/external-provisioner🐹github.com/kubernetes-csi/external-provisioner🐹github.com/kubernetes-csi/external-provisioner🐹github.com/kubernetes-csi/external-provisioner🐹github.com/kubernetes-csi/external-snapshotter/v6🐹github.com/kubernetes-csi/external-snapshotter/v6🐹github.com/kubernetes-csi/external-snapshotter/v6+2 moreReal-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
Improper input validation in Kubernetes CSI sidecar containers for external-provisioner (<v0.4.3, <v1.0.2, v1.1, <v1.2.2, <v1.3.1), external-snapshotter (<v0.4.2, <v1.0.2, v1.1, <1.2.2), and external-resizer (v0.1, v0.2) could result in unauthorized PersistentVolume data access or volume mutation during snapshot, restore from snapshot, cloning and resizing operations.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/kubernetes-csi/external-provisioner | all versions | 0.4.3 |
| 🐹Go | github.com/kubernetes-csi/external-provisioner | ≥ 1.0.0&&< 1.0.2 | 1.0.2 |
| 🐹Go | github.com/kubernetes-csi/external-provisioner | all versions | No fix |
| 🐹Go | github.com/kubernetes-csi/external-provisioner | ≥ 1.2.0&&< 1.2.2 | 1.2.2 |
| 🐹Go | github.com/kubernetes-csi/external-provisioner | ≥ 1.3.0&&< 1.3.1 | 1.3.1 |
| 🐹Go | github.com/kubernetes-csi/external-snapshotter/v6 | ≥ 1.0.0&&< 1.0.2 | 1.0.2 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/kubernetes-csi/external-provisioner. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update github.com/kubernetes-csi/external-provisioner to 0.4.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-11255 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether CVE-2019-11255 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to CVE-2019-11255. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2019-11255 in your dependencies?
O3 detects CVE-2019-11255 across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.