Vulnerability-Lookup

GHSA-6R7F-3FWQ-HQ74

Vulnerability from github – Published: 2026-03-09 17:28 – Updated: 2026-03-10 18:43

Summary

Kubewarden: Cross-namespace data exfiltration via deprecated host callback binding

Details

Impact

An attacker with privileged "AdmissionPolicy" create permissions (which isn't the default) could make use of 3 deprecated host-callback APIs: kubernetes/ingresses, kubernetes/namespaces, kubernetes/services. The attacker can craft a policy that exercises these deprecated API calls and would allow them read access to Ingresses, Namespaces, and Services resources respectively.

This attack is read-only, there is no write capability and no access to Secrets, ConfigMaps, or other resource types beyond these three. The attacker could read for example: - Namespace names and labels. - Services across all namespaces with ClusterIPs and ports to reveal cluster internal topology. - Ingresses across all namespaces with hostnames and routing rules.

Patches

The vulnerable, already deprecated host-capabilities (kubernetes/ingresses, kubernetes/namespaces, kubernetes/services) have been removed.

The removed calls were not being exercised by any Kubewarden SDK.

These host-callbacks had already been superseded for a long time by kubewarden/kubernetes/list_resources_by_namespace, kubewarden/kubernetes/list_resources, and kubewarden/kubernetes/get_resource. They provide similar capabilities while being more fine-grained, performant, and gated through our context-aware permissions feature. These current host-capabilities are part of the Kubernetes capabilities listed in our docs.

Workarounds

Kubewarden operators can update the policy-server image used by their PolicyServers to tag :v1.33.0. Alternatively, Kubewarden operators can temporarily reduce the permissions of users to prevent them from creating or updating existing namespaced AdmissionPolicies or AdmissionPolicyGroups.

Severity

4.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/kubewarden/kubewarden-controller"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.33.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-29773"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-09T17:28:38Z",
    "nvd_published_at": "2026-03-10T17:39:03Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nKubewarden is a policy engine for Kubernetes. Kubewarden cluster operators can grant permissions to users to deploy namespaced AdmissionPolicies and AdmissionPolicyGroups in their Namespaces. One of Kubewarden promises is that configured users can deploy namespaced policies in a safe manner, without privilege escalation.\n\nAn attacker with privileged \"AdmissionPolicy\" create permissions (which isn\u0027t the default) could make use of 3 deprecated host-callback APIs: `kubernetes/ingresses`, `kubernetes/namespaces`, `kubernetes/services`.\nThe attacker can craft a policy that exercises these deprecated API calls and would allow them read access to Ingresses, Namespaces, and Services resources respectively.\n\nThis attack is read-only, there is no write capability and no access to Secrets, ConfigMaps, or other resource types beyond these three. The attacker could read for example:\n- Namespace names and labels.\n- Services across all namespaces with ClusterIPs and ports to reveal cluster internal topology.\n- Ingresses across all namespaces with hostnames and routing rules.\n\n### Patches\nThe vulnerable, already deprecated host-capabilities (`kubernetes/ingresses`, `kubernetes/namespaces`, `kubernetes/services`)\nhave been removed.\n\nThe removed calls were not being exercised by any Kubewarden SDK.\n\nThese host-callbacks had already been superseded for a long time by `kubewarden/kubernetes/list_resources_by_namespace`, `kubewarden/kubernetes/list_resources`, and `kubewarden/kubernetes/get_resource`. They provide similar capabilities while being more fine-grained, performant, and gated through our context-aware permissions feature. These current host-capabilities are part of the Kubernetes capabilities listed in our [docs](https://docs.kubewarden.io/reference/spec/host-capabilities/kubernetes).\n\n### Workarounds\nKubewarden operators can update the policy-server image used by their PolicyServers to tag `:v1.33.0`.\nAlternatively, Kubewarden operators can temporarily reduce the permissions of users to prevent them from creating or updating existing namespaced AdmissionPolicies or AdmissionPolicyGroups.",
  "id": "GHSA-6r7f-3fwq-hq74",
  "modified": "2026-03-10T18:43:12Z",
  "published": "2026-03-09T17:28:38Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/kubewarden/kubewarden-controller/security/advisories/GHSA-6r7f-3fwq-hq74"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29773"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kubewarden/kubewarden-controller/pull/1519"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kubewarden/kubewarden-controller/commit/4e41b60ae44902d82d94101bac93fb77cae65651"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/kubewarden/kubewarden-controller"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Kubewarden: Cross-namespace data exfiltration via deprecated host callback binding"
}

CVE-2026-29773 (GCVE-0-2026-29773)

Vulnerability from cvelistv5 – Published: 2026-03-09 22:23 – Updated: 2026-03-10 14:31

Title

kubewarden-controller cross-namespace data exfiltration via deprecated host callback binding

Summary

Kubewarden is a policy engine for Kubernetes. Kubewarden cluster operators can grant permissions to users to deploy namespaced AdmissionPolicies and AdmissionPolicyGroups in their Namespaces. One of Kubewarden promises is that configured users can deploy namespaced policies in a safe manner, without privilege escalation. An attacker with privileged "AdmissionPolicy" create permissions (which isn't the default) could make use of 3 deprecated host-callback APIs: kubernetes/ingresses, kubernetes/namespaces, kubernetes/services. The attacker can craft a policy that exercises these deprecated API calls and would allow them read access to Ingresses, Namespaces, and Services resources respectively. This attack is read-only, there is no write capability and no access to Secrets, ConfigMaps, or other resource types beyond these three.

Severity

4.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-10 14:31 UTC

CWE

CWE-863 - Incorrect Authorization

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7637 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/kubewarden/kubewarden-controll…	x_refsource_CONFIRM
https://github.com/kubewarden/kubewarden-controll…	x_refsource_MISC
https://github.com/kubewarden/kubewarden-controll…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
kubewarden	kubewarden-controller	Affected: < 1.33.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-29773",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-10T14:31:41.500373Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-10T14:31:47.680Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "kubewarden-controller",
          "vendor": "kubewarden",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.33.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Kubewarden is a policy engine for Kubernetes. Kubewarden cluster operators can grant permissions to users to deploy namespaced AdmissionPolicies and AdmissionPolicyGroups in their Namespaces. One of Kubewarden promises is that configured users can deploy namespaced policies in a safe manner, without privilege escalation. An attacker with privileged \"AdmissionPolicy\" create permissions (which isn\u0027t the default) could make use of 3 deprecated host-callback APIs: kubernetes/ingresses, kubernetes/namespaces, kubernetes/services. The attacker can craft a policy that exercises these deprecated API calls and would allow them read access to Ingresses, Namespaces, and Services resources respectively. \nThis attack is read-only, there is no write capability and no access to Secrets, ConfigMaps, or other resource types beyond these three."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-09T22:24:55.471Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/kubewarden/kubewarden-controller/security/advisories/GHSA-6r7f-3fwq-hq74",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/kubewarden/kubewarden-controller/security/advisories/GHSA-6r7f-3fwq-hq74"
        },
        {
          "name": "https://github.com/kubewarden/kubewarden-controller/pull/1519",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/kubewarden/kubewarden-controller/pull/1519"
        },
        {
          "name": "https://github.com/kubewarden/kubewarden-controller/commit/4e41b60ae44902d82d94101bac93fb77cae65651",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/kubewarden/kubewarden-controller/commit/4e41b60ae44902d82d94101bac93fb77cae65651"
        }
      ],
      "source": {
        "advisory": "GHSA-6r7f-3fwq-hq74",
        "discovery": "UNKNOWN"
      },
      "title": "kubewarden-controller cross-namespace data exfiltration via deprecated host callback binding"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-29773",
    "datePublished": "2026-03-09T22:23:57.793Z",
    "dateReserved": "2026-03-04T16:26:02.897Z",
    "dateUpdated": "2026-03-10T14:31:47.680Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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