Vulnerability-Lookup

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

CWE

CWE-863 - Incorrect Authorization

Assigner

GitHub_M

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

{
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            "other": {
              "content": {
                "id": "CVE-2026-29773",
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        }
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        "discovery": "UNKNOWN"
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    }
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    "dateReserved": "2026-03-04T16:26:02.897Z",
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FKIE_CVE-2026-29773

Vulnerability from fkie_nvd - Published: 2026-03-10 17:39 - Updated: 2026-05-13 20:44

Severity ?

4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/kubewarden/kubewarden-controller/commit/4e41b60ae44902d82d94101bac93fb77cae65651	Patch
security-advisories@github.com	https://github.com/kubewarden/kubewarden-controller/pull/1519	Issue Tracking, Patch
security-advisories@github.com	https://github.com/kubewarden/kubewarden-controller/security/advisories/GHSA-6r7f-3fwq-hq74	Mitigation, Vendor Advisory

Impacted products

	Vendor	Product	Version
	linuxfoundation	kubewarden	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:linuxfoundation:kubewarden:*:*:*:*:*:kubernetes:*:*",
              "matchCriteriaId": "678673D0-E5E1-4900-BEF8-1847CD413034",
              "versionEndExcluding": "1.33.0",
              "versionStartIncluding": "1.6.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "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."
    },
    {
      "lang": "es",
      "value": "Kubewarden es un motor de pol\u00edticas para Kubernetes. Los operadores de cl\u00faster de Kubewarden pueden otorgar permisos a los usuarios para desplegar AdmissionPolicies y AdmissionPolicyGroups con \u00e1mbito de nombre de espacio en sus Namespaces. Una de las promesas de Kubewarden es que los usuarios configurados pueden desplegar pol\u00edticas con \u00e1mbito de nombre de espacio de manera segura, sin escalada de privilegios. Un atacante con permisos privilegiados de creaci\u00f3n de \u0027AdmissionPolicy\u0027 (lo cual no es el valor predeterminado) podr\u00eda hacer uso de 3 API de devoluci\u00f3n de llamada de host obsoletas: kubernetes/ingresses, kubernetes/namespaces, kubernetes/services. El atacante puede elaborar una pol\u00edtica que utilice estas llamadas a la API obsoletas y les permitir\u00eda acceso de lectura a los recursos Ingresses, Namespaces y Services respectivamente.\nEste ataque es de solo lectura, no hay capacidad de escritura y no hay acceso a Secrets, ConfigMaps u otros tipos de recursos m\u00e1s all\u00e1 de estos tres."
    }
  ],
  "id": "CVE-2026-29773",
  "lastModified": "2026-05-13T20:44:20.023",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
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        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
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  },
  "published": "2026-03-10T17:39:03.210",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
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    },
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      "source": "security-advisories@github.com",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/kubewarden/kubewarden-controller/pull/1519"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/kubewarden/kubewarden-controller/security/advisories/GHSA-6r7f-3fwq-hq74"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
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        {
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        }
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      "type": "Primary"
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}

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"
}

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.

Detection rules are retrieved from Rulezet.

Action not permitted

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

FKIE_CVE-2026-29773

GHSA-6R7F-3FWQ-HQ74

Impact

Patches

Workarounds

Tags

Sightings

Nomenclature