{
    "document": {
        "category": "csaf_base",
        "csaf_version": "2.0",
        "distribution": {
            "tlp": {
                "label": "WHITE"
            }
        },
        "lang": "en",
        "notes": [
            {
                "category": "legal_disclaimer",
                "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
            }
        ],
        "publisher": {
            "category": "coordinator",
            "contact_details": "cert@ncsc.nl",
            "name": "National Cyber Security Centre",
            "namespace": "https://www.ncsc.nl/"
        },
        "title": "CVE-2026-33343",
        "tracking": {
            "current_release_date": "2026-03-31T06:20:58.865548Z",
            "generator": {
                "date": "2026-02-17T15:00:00Z",
                "engine": {
                    "name": "V.E.L.M.A",
                    "version": "1.7"
                }
            },
            "id": "CVE-2026-33343",
            "initial_release_date": "2026-03-20T20:40:26.523703Z",
            "revision_history": [
                {
                    "date": "2026-03-20T20:40:26.523703Z",
                    "number": "1",
                    "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)."
                },
                {
                    "date": "2026-03-20T20:40:29.604714Z",
                    "number": "2",
                    "summary": "NCSC Score created."
                },
                {
                    "date": "2026-03-23T13:46:28.778017Z",
                    "number": "3",
                    "summary": "Source created.| CVE status created. (valid)| Products created (3).| References created (4)."
                },
                {
                    "date": "2026-03-23T13:46:40.048315Z",
                    "number": "4",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-26T14:27:15.478129Z",
                    "number": "5",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)."
                },
                {
                    "date": "2026-03-26T14:27:18.678252Z",
                    "number": "6",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-26T14:39:21.002688Z",
                    "number": "7",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (3).| References created (1).| CWES updated (1)."
                },
                {
                    "date": "2026-03-26T14:39:23.069976Z",
                    "number": "8",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-26T15:38:16.290721Z",
                    "number": "9",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-26T19:39:18.708217Z",
                    "number": "10",
                    "summary": "Unknown change."
                },
                {
                    "date": "2026-03-26T21:26:37.534434Z",
                    "number": "11",
                    "summary": "Products created (3).| Product Identifiers created (3)."
                },
                {
                    "date": "2026-03-26T21:26:46.958802Z",
                    "number": "12",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-27T00:42:44.689627Z",
                    "number": "13",
                    "summary": "Source created.| CVE status created. (valid)| Products connected (2)."
                },
                {
                    "date": "2026-03-27T00:42:51.470953Z",
                    "number": "14",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-27T06:43:06.704602Z",
                    "number": "15",
                    "summary": "Description created for source."
                },
                {
                    "date": "2026-03-27T19:40:54.823293Z",
                    "number": "16",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (4).| Product Identifiers created (2).| Product Remediations created (4).| References created (3).| CWES updated (1).| Vendor_assessment created."
                },
                {
                    "date": "2026-03-27T19:40:56.352776Z",
                    "number": "17",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-27T19:47:38.029545Z",
                    "number": "18",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (4).| References created (1).| CWES updated (1)."
                },
                {
                    "date": "2026-03-27T19:47:42.456916Z",
                    "number": "19",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-27T20:28:46.257289Z",
                    "number": "20",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (3).| References created (2)."
                },
                {
                    "date": "2026-03-27T20:28:57.341318Z",
                    "number": "21",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-27T20:57:18.501490Z",
                    "number": "22",
                    "summary": "Source connected.| CVE status created. (valid)| EPSS created."
                },
                {
                    "date": "2026-03-27T20:57:28.620982Z",
                    "number": "23",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-28T07:58:12.871518Z",
                    "number": "24",
                    "summary": "References created (1)."
                },
                {
                    "date": "2026-03-28T12:19:57.419029Z",
                    "number": "25",
                    "summary": "Source connected.| CVE status created. (valid)| Description created for source.| CVSS created.| CWES updated (1)."
                },
                {
                    "date": "2026-03-28T12:19:59.818015Z",
                    "number": "26",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-30T09:27:21.882726Z",
                    "number": "27",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-31T06:19:47.365351Z",
                    "number": "28",
                    "summary": "Products created (2).| Product Identifiers created (2).| Product Remediations created (1)."
                },
                {
                    "date": "2026-03-31T06:19:54.051681Z",
                    "number": "29",
                    "summary": "NCSC Score updated."
                }
            ],
            "status": "interim",
            "version": "29"
        }
    },
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    "vulnerabilities": [
        {
            "cve": "CVE-2026-33343",
            "cwe": {
                "id": "CWE-863",
                "name": "Incorrect Authorization"
            },
            "notes": [
                {
                    "category": "description",
                    "text": "### Impact\n_What kind of vulnerability is it? Who is impacted?_\n\nAn authenticated user with RBAC restricted permissions on key ranges can use nested transactions to bypass all key-level authorization. This allows any authenticated user with direct access to etcd to effectively ignore all key range restrictions, accessing the entire etcd data store.  \n \nKubernetes does not rely on etcd’s built-in authentication and authorization. Instead, the API server handles authentication and authorization itself, so typical Kubernetes deployments are not affected.\n\n### Patches\n_Has the problem been patched? What versions should users upgrade to?_\n\nThis vulnerability is patched in the following versions:\n\n* etcd 3.6.9\n* etcd 3.5.28\n* etcd 3.4.42\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\nIf upgrading is not immediately possible, reduce exposure by treating the affected\nRPCs as unauthenticated in practice.\n\n* restrict network access to etcd server ports so only trusted components can connect\n* require strong client identity at the transport layer, such as mTLS with tightly scoped client certificate\ndistribution\n\n### Reporters\n_Our community helps keep etcd secure_\n\nSIG-Etcd thanks community members Luke Francis and Battulga Byambaa for reporting this vulnerability.",
                    "title": "github - https://api.github.com/advisories/GHSA-rfx7-8w68-q57q"
                },
                {
                    "category": "description",
                    "text": "etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.4.42, 3.5.28, and 3.6.9, an authenticated user with RBAC restricted permissions on key ranges can use nested transactions to bypass all key-level authorization. This allows any authenticated user with direct access to etcd to effectively ignore all key range restrictions, accessing the entire etcd data store. Kubernetes does not rely on etcd’s built-in authentication and authorization. Instead, the API server handles authentication and authorization itself, so typical Kubernetes deployments are not affected. Versions 3.4.42, 3.5.28, and 3.6.9 contain a patch. If upgrading is not immediately possible, reduce exposure by treating the affected RPCs as unauthenticated in practice. Restrict network access to etcd server ports so only trusted components can connect and require strong client identity at the transport layer, such as mTLS with tightly scoped client certificate distribution.",
                    "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33343"
                },
                {
                    "category": "description",
                    "text": "etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.4.42, 3.5.28, and 3.6.9, an authenticated user with RBAC restricted permissions on key ranges can use nested transactions to bypass all key-level authorization. This allows any authenticated user with direct access to etcd to effectively ignore all key range restrictions, accessing the entire etcd data store. Kubernetes does not rely on etcd’s built-in authentication and authorization. Instead, the API server handles authentication and authorization itself, so typical Kubernetes deployments are not affected. Versions 3.4.42, 3.5.28, and 3.6.9 contain a patch. If upgrading is not immediately possible, reduce exposure by treating the affected RPCs as unauthenticated in practice. Restrict network access to etcd server ports so only trusted components can connect and require strong client identity at the transport layer, such as mTLS with tightly scoped client certificate distribution.",
                    "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33343.json"
                },
                {
                    "category": "description",
                    "text": "etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.4.42, 3.5.28, and 3.6.9, an authenticated user with RBAC restricted permissions on key ranges can use nested transactions to bypass all key-level authorization. This allows any authenticated user with direct access to etcd to effectively ignore all key range restrictions, accessing the entire etcd data store. Kubernetes does not rely on etcd’s built-in authentication and authorization. Instead, the API server handles authentication and authorization itself, so typical Kubernetes deployments are not affected. Versions 3.4.42, 3.5.28, and 3.6.9 contain a patch. If upgrading is not immediately possible, reduce exposure by treating the affected RPCs as unauthenticated in practice. Restrict network access to etcd server ports so only trusted components can connect and require strong client identity at the transport layer, such as mTLS with tightly scoped client certificate distribution.",
                    "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-33343"
                },
                {
                    "category": "description",
                    "text": "A flaw was found in etcd, a distributed key-value store. An authenticated user with Role-Based Access Control (RBAC) restricted permissions on key ranges can exploit this flaw by using nested transactions. This bypasses all key-level authorization, allowing the user to access the entire etcd data store. This can lead to significant information disclosure.",
                    "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33343.json"
                },
                {
                    "category": "description",
                    "text": "### Impact\n_What kind of vulnerability is it? Who is impacted?_\n\nAn authenticated user with RBAC restricted permissions on key ranges can use nested transactions to bypass all key-level authorization. This allows any authenticated user with direct access to etcd to effectively ignore all key range restrictions, accessing the entire etcd data store.  \n \nKubernetes does not rely on etcd’s built-in authentication and authorization. Instead, the API server handles authentication and authorization itself, so typical Kubernetes deployments are not affected.\n\n### Patches\n_Has the problem been patched? What versions should users upgrade to?_\n\nThis vulnerability is patched in the following versions:\n\n* etcd 3.6.9\n* etcd 3.5.28\n* etcd 3.4.42\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\nIf upgrading is not immediately possible, reduce exposure by treating the affected\nRPCs as unauthenticated in practice.\n\n* restrict network access to etcd server ports so only trusted components can connect\n* require strong client identity at the transport layer, such as mTLS with tightly scoped client certificate\ndistribution\n\n### Reporters\n_Our community helps keep etcd secure_\n\nSIG-Etcd thanks community members Luke Francis and Battulga Byambaa for reporting this vulnerability.",
                    "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGHSA-rfx7-8w68-q57q.json?alt=media"
                },
                {
                    "category": "description",
                    "text": "etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.4.42, 3.5.28, and 3.6.9, an authenticated user with RBAC restricted permissions on key ranges can use nested transactions to bypass all key-level authorization. This allows any authenticated user with direct access to etcd to effectively ignore all key range restrictions, accessing the entire etcd data store. Kubernetes does not rely on etcd’s built-in authentication and authorization. Instead, the API server handles authentication and authorization itself, so typical Kubernetes deployments are not affected. Versions 3.4.42, 3.5.28, and 3.6.9 contain a patch. If upgrading is not immediately possible, reduce exposure by treating the affected RPCs as unauthenticated in practice. Restrict network access to etcd server ports so only trusted components can connect and require strong client identity at the transport layer, such as mTLS with tightly scoped client certificate distribution.",
                    "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Bitnami%2FBIT-etcd-2026-33343.json?alt=media"
                },
                {
                    "category": "description",
                    "text": "etcd: Nested etcd transactions bypass RBAC authorization checks",
                    "title": "microsoft - https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar"
                },
                {
                    "category": "other",
                    "text": "0.00029",
                    "title": "EPSS"
                },
                {
                    "category": "other",
                    "text": "4.1",
                    "title": "NCSC Score"
                },
                {
                    "category": "other",
                    "text": "VENDOR FIX as product remediation category, There is product data available from source Certbundde",
                    "title": "NCSC Score top increasing factors"
                },
                {
                    "category": "other",
                    "text": "Is related to (a version of) an uncommon product, There is product data available from source Debian, Is related to a product by vendor Debian",
                    "title": "NCSC Score top decreasing factors"
                },
                {
                    "category": "details",
                    "text": "Severity: 2\n",
                    "title": "Vendor assessment"
                }
            ],
            "product_status": {
                "known_affected": [
                    "CSAFPID-5892268",
                    "CSAFPID-5892269",
                    "CSAFPID-5892270",
                    "CSAFPID-5918014",
                    "CSAFPID-5918015",
                    "CSAFPID-5918016",
                    "CSAFPID-5919269",
                    "CSAFPID-5919270",
                    "CSAFPID-5919271",
                    "CSAFPID-1411002",
                    "CSAFPID-1411003",
                    "CSAFPID-1441187",
                    "CSAFPID-1441193",
                    "CSAFPID-1920016",
                    "CSAFPID-1920018",
                    "CSAFPID-5944309",
                    "CSAFPID-5944310",
                    "CSAFPID-5955615",
                    "CSAFPID-5955616",
                    "CSAFPID-5955617",
                    "CSAFPID-5967075",
                    "CSAFPID-5967076"
                ]
            },
            "references": [
                {
                    "category": "external",
                    "summary": "Source - github",
                    "url": "https://api.github.com/advisories/GHSA-rfx7-8w68-q57q"
                },
                {
                    "category": "external",
                    "summary": "Source - certbundde",
                    "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0818.json"
                },
                {
                    "category": "external",
                    "summary": "Source - nvd",
                    "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33343"
                },
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33343.json"
                },
                {
                    "category": "external",
                    "summary": "Source - debian",
                    "url": "https://security-tracker.debian.org/tracker/CVE-2026-33343"
                },
                {
                    "category": "external",
                    "summary": "Source - redhat",
                    "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33343.json"
                },
                {
                    "category": "external",
                    "summary": "Source - osv",
                    "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGHSA-rfx7-8w68-q57q.json?alt=media"
                },
                {
                    "category": "external",
                    "summary": "Source - osv",
                    "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Bitnami%2FBIT-etcd-2026-33343.json?alt=media"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Source - microsoft",
                    "url": "https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2026-Mar"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; github; nvd; osv; redhat",
                    "url": "https://github.com/etcd-io/etcd/security/advisories/GHSA-rfx7-8w68-q57q"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde; github",
                    "url": "https://github.com/advisories/GHSA-rfx7-8w68-q57q"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0818.json"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0818"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://github.com/advisories/GHSA-q8m4-xhhv-38mg"
                },
                {
                    "category": "external",
                    "summary": "Reference - redhat",
                    "url": "https://www.cve.org/CVERecord?id=CVE-2026-33343"
                },
                {
                    "category": "external",
                    "summary": "Reference - github; osv; redhat",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33343"
                }
            ],
            "remediations": [
                {
                    "category": "mitigation",
                    "details": "To reduce exposure, restrict network access to etcd server ports, ensuring only trusted components can connect. Additionally, implement strong client identity at the transport layer, such as mTLS with tightly scoped client certificate distribution. This limits direct access to the etcd data store, which is a prerequisite for exploiting this vulnerability. If etcd is configured to reload, a service restart may be required for these changes to take effect.",
                    "product_ids": [
                        "CSAFPID-1441187",
                        "CSAFPID-1441193",
                        "CSAFPID-1920016",
                        "CSAFPID-1920018"
                    ]
                },
                {
                    "category": "vendor_fix",
                    "details": "CBL-Mariner Releases",
                    "product_ids": [
                        "CSAFPID-5967076"
                    ]
                }
            ],
            "scores": [
                {
                    "cvss_v3": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                        "baseScore": 6.5,
                        "baseSeverity": "MEDIUM"
                    },
                    "products": [
                        "CSAFPID-1411002",
                        "CSAFPID-1411003",
                        "CSAFPID-1441187",
                        "CSAFPID-1441193",
                        "CSAFPID-1920016",
                        "CSAFPID-1920018",
                        "CSAFPID-5892268",
                        "CSAFPID-5892269",
                        "CSAFPID-5892270",
                        "CSAFPID-5918014",
                        "CSAFPID-5918015",
                        "CSAFPID-5918016",
                        "CSAFPID-5919269",
                        "CSAFPID-5919270",
                        "CSAFPID-5919271",
                        "CSAFPID-5944309",
                        "CSAFPID-5944310",
                        "CSAFPID-5955615",
                        "CSAFPID-5955616",
                        "CSAFPID-5955617",
                        "CSAFPID-5967075",
                        "CSAFPID-5967076"
                    ]
                }
            ],
            "title": "CVE-2026-33343"
        }
    ]
}