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Response snapshot Nov 3, 2026, 21:16 UTC

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VulnerabilityCVE-2026-82976

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...

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.

Published Updated

At a glance

Exploited
Not known
Severity
7.1 High (CVSS 3.1)
Chance of exploitation
Not estimated
Sources
1 source

What to do

Check the vendor advisory for affected versions and fixes.

Read NVD CVE-2026-82976 (opens a new tab)

What happened

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

Continue reading

pkg/imagehandler/imagefilesystem.go — root directory is browsable and enumerates all UUID image names

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

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

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.

Scores and how they were measured

CVSS base severity

7.1

Version 3.1As of

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Sources

  1. Primary source

    NVD CVE-2026-82976 (opens a new tab)

    NVD record: description, CVSS (the CNA score is preferred), affected products, and publication date. Not evidence of exploitation.

    Published Checked

  2. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  3. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  4. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, November 3). 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... (CVE-2026-82976). https://kevwire.com/record/CVE-2026-82976

MLA

"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... (CVE-2026-82976)." KEVWire, 3 Nov. 2026, kevwire.com/record/CVE-2026-82976.

Chicago

KEVWire. "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... (CVE-2026-82976)." Last modified November 3, 2026. https://kevwire.com/record/CVE-2026-82976.

Evidence summary (plain text)

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... (Nov 3, 2026).
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.
CVSS 7.1 (version 3.1; evidence as of Nov 3, 2026; https://nvd.nist.gov/vuln/detail/CVE-2026-82976).
Sources:
NVD CVE-2026-82976: https://nvd.nist.gov/vuln/detail/CVE-2026-82976
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-11-03T19:16:00.613Z&lastModEndDate=2026-11-03T20:55:57.138Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-11-03T18:41:03.980Z&lastModEndDate=2026-11-03T20:15:56.779Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-11-03T18:06:04.789Z&lastModEndDate=2026-11-03T19:40:57.574Z&resultsPerPage=500&startIndex=0
Record ID: CVE-2026-82976.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Nov 3, 2026, 20:55 UTC. Ingestion is not an independent editorial investigation.

NVD status: Awaiting Analysis. Publication in the NVD is not evidence of exploitation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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Record details

Record detail