OpenShift Bare Metal: Unsecured HTTP Server Exposes Images & Pull Secret
CVE-2026-82976 Published on November 3, 2026
Image-customization-controller: unauthenticated plaintext image server with directory listing exposes ignition images containing cluster pull secret
A flaw was found in the image-customization-controller used in OpenShift's bare metal provisioning stack. The controller registers an HTTP file server on port 8084 with no authentication. The custom imageFileSystem implementation exposes a browsable HTML directory listing of all registered images at the root path. The only access control on per-host images is the random UUID filename; the directory listing discloses those UUIDs to any caller on the provisioning network. Each served image embeds an Ignition config containing the base64-encoded cluster pull secret, optional IRONIC_RAMDISK_SSH_KEY, proxy settings, and per-host NetworkManager keyfiles. An adjacent network attacker can enumerate all image UUIDs via directory listing, download any image, extract the embedded Ignition config, and recover the cluster pull secret and SSH key.
### Evidence
**pkg/imagehandler/imagefilesystem.go root directory is browsable and enumerates all UUID image names**
```go
func (f *imageFileSystem) Readdir(n int) ([]fs.FileInfo, error) {
f.mu.Lock()
defer f.mu.Unlock()
result := []fs.FileInfo{}
for _, im := range f.images {
result = append(result, im)
}
return result, nil
}
func (f *imageFileSystem) Open(name string) (http.File, error) {
f.log.Info("Open", "path", name)
if name == "/" {
return f, nil
}
...
```
**cmd/controller/main.go file server bound on all interfaces without auth or TLS**
```go
http.Handle("/", http.FileServer(imageServer.FileSystem()))
go func() {
server := &http.Server{
Addr: imagesBindAddr, // default ":8084"
ReadHeaderTimeout: 5 * time.Second,
}
err := server.ListenAndServe()
```
**pkg/ignition/service_config.go:94-100 pull secret is embedded in every served image**
```go
func (b *ignitionBuilder) authFile() ignition_config_types_32.File {
source := "data:;base64," + strings.TrimSpace(b.ironicAgentPullSecret)
return ignition_config_types_32.File{
Node: ignition_config_types_32.Node{Path: "/etc/authfile.json"},
...
```
### Attack Pattern
Adjacent provisioning-network client GET / lists UUID image names download ISO/initramfs extract embedded Ignition recover cluster pull secret and SSH key.
Vulnerability Analysis
Timeline
Reported to Red Hat.
Made public. 88 days later.
Weakness Type
Exposure of Information Through Directory Listing
A directory listing is inappropriately exposed, yielding potentially sensitive information to attackers. A directory listing provides an attacker with the complete index of all the resources located inside of the directory. The specific risks and consequences vary depending on which files are listed and accessible.
Products Associated with CVE-2026-82976
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