CVE-2019-11255
MEDIUMCVE-2019-11255 is a medium-severity (CVSS 6.5) Improper Input Validation vulnerability in github.com/kubernetes-csi/external-provisioner. O3 Security confirms whether CVE-2019-11255 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Kubernetes 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.
Real-World Exposure
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.