{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-40557",
        "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "state": "PUBLISHED",
        "assignerShortName": "apache",
        "dateReserved": "2026-04-14T11:20:51.218Z",
        "datePublished": "2026-04-27T13:12:11.118Z",
        "dateUpdated": "2026-04-30T15:21:01.170Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "collectionURL": "https://repo.maven.apache.org/maven2/",
                    "defaultStatus": "unaffected",
                    "packageName": "org.apache.storm:storm-metrics-prometheus",
                    "product": "Apache Storm Prometheus Reporter",
                    "vendor": "Apache Software Foundation",
                    "versions": [
                        {
                            "lessThan": "2.8.7",
                            "status": "affected",
                            "version": "2.6.3",
                            "versionType": "semver"
                        }
                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "finder",
                    "value": "K"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "<p><strong>Improper Certificate Validation via Global SSL Context Downgrade in Apache Storm Prometheus Reporter</strong></p>\n<p><b>Versions Affected: </b>from 2.6.3 to 2.8.6</p>\n<p><b>Description:&nbsp;</b></p><p><span style=\"background-color: rgb(255, 255, 255);\">In production deployments where an administrator enables </span><code>storm.daemon.metrics.reporter.plugin.prometheus.skip_tls_validation&nbsp;</code>(by default it is disabled)&nbsp;<span style=\"background-color: rgb(255, 255, 255);\">intending to affect only the Prometheus reporter, the undocumented global side effect creates an attack surface across every TLS-protected communication channel in the Storm daemon.</span><b><br></b></p><p>The <code>PrometheusPreparableReporter</code> class implements an <code>INSECURE_TRUST_MANAGER</code> that accepts all SSL certificates without validation, with empty <code>checkClientTrusted</code> and <code>checkServerTrusted</code> methods. Most critically, when the <code>storm.daemon.metrics.reporter.plugin.prometheus.skip_tls_validation</code> configuration option is enabled (default = disabled) for HTTPS Prometheus PushGateway connections, the <code>INSECURE_CONNECTION_FACTORY</code> calls <code>SSLContext.setDefault(sslContext)</code>, which globally replaces the JVM's default SSL context rather than applying the insecure context only to the Prometheus connection. This payload flows through storm.yaml configuration → <code>PrometheusPreparableReporter.prepare()</code> → <code>INSECURE_CONNECTION_FACTORY</code> → <code>SSLContext.setDefault()</code>, resulting in a JVM-wide TLS security downgrade. All subsequent HTTPS connections in the process - including ZooKeeper, Thrift, Netty, and UI connections - silently trust all certificates, including self-signed, expired, and attacker-generated ones, enabling man-in-the-middle interception of cluster state, topology submissions, tuple data, and administrative credentials.<br></p>\n\n<p><b>Mitigation:</b> 2.x users should upgrade to 2.8.7 if the Prometheus Metrics Reporter is used. Prometheus Metrics Reporter Users who cannot upgrade immediately should remove the <code>storm.daemon.metrics.reporter.plugin.prometheus.skip_tls_validation: true</code> setting from their storm.yaml configuration and instead configure a proper truststore containing the PushGateway's certificate.<br></p>\n<br>"
                        }
                    ],
                    "value": "Improper Certificate Validation via Global SSL Context Downgrade in Apache Storm Prometheus Reporter\n\n\nVersions Affected: from 2.6.3 to 2.8.6\n\n\nDescription: \n\nIn production deployments where an administrator enables storm.daemon.metrics.reporter.plugin.prometheus.skip_tls_validation (by default it is disabled) intending to affect only the Prometheus reporter, the undocumented global side effect creates an attack surface across every TLS-protected communication channel in the Storm daemon.\n\n\nThe PrometheusPreparableReporter class implements an INSECURE_TRUST_MANAGER that accepts all SSL certificates without validation, with empty checkClientTrusted and checkServerTrusted methods. Most critically, when the storm.daemon.metrics.reporter.plugin.prometheus.skip_tls_validation configuration option is enabled (default = disabled) for HTTPS Prometheus PushGateway connections, the INSECURE_CONNECTION_FACTORY calls SSLContext.setDefault(sslContext), which globally replaces the JVM's default SSL context rather than applying the insecure context only to the Prometheus connection. This payload flows through storm.yaml configuration → PrometheusPreparableReporter.prepare() → INSECURE_CONNECTION_FACTORY → SSLContext.setDefault(), resulting in a JVM-wide TLS security downgrade. All subsequent HTTPS connections in the process - including ZooKeeper, Thrift, Netty, and UI connections - silently trust all certificates, including self-signed, expired, and attacker-generated ones, enabling man-in-the-middle interception of cluster state, topology submissions, tuple data, and administrative credentials.\n\n\n\n\nMitigation: 2.x users should upgrade to 2.8.7 if the Prometheus Metrics Reporter is used. Prometheus Metrics Reporter Users who cannot upgrade immediately should remove the storm.daemon.metrics.reporter.plugin.prometheus.skip_tls_validation: true setting from their storm.yaml configuration and instead configure a proper truststore containing the PushGateway's certificate."
                }
            ],
            "metrics": [
                {
                    "other": {
                        "content": {
                            "text": "moderate"
                        },
                        "type": "Textual description of severity"
                    }
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-295",
                            "description": "CWE-295 Improper Certificate Validation",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
                "shortName": "apache",
                "dateUpdated": "2026-04-27T13:12:11.118Z"
            },
            "references": [
                {
                    "tags": [
                        "vendor-advisory"
                    ],
                    "url": "https://lists.apache.org/thread/f5bv68z1y5xstz22psjk05p3wn86knjq"
                }
            ],
            "source": {
                "discovery": "EXTERNAL"
            },
            "title": "Apache Storm Prometheus Reporter: Disabling TLS verification for Prometheus Reporter also disables it for all other connections",
            "x_generator": {
                "engine": "Vulnogram 0.2.0"
            }
        },
        "adp": [
            {
                "title": "CVE Program Container",
                "references": [
                    {
                        "url": "http://www.openwall.com/lists/oss-security/2026/04/25/2"
                    }
                ],
                "providerMetadata": {
                    "orgId": "af854a3a-2127-422b-91ae-364da2661108",
                    "shortName": "CVE",
                    "dateUpdated": "2026-04-27T13:36:44.872Z"
                }
            },
            {
                "metrics": [
                    {
                        "cvssV3_1": {
                            "scope": "UNCHANGED",
                            "version": "3.1",
                            "baseScore": 4.8,
                            "attackVector": "NETWORK",
                            "baseSeverity": "MEDIUM",
                            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
                            "integrityImpact": "LOW",
                            "userInteraction": "NONE",
                            "attackComplexity": "HIGH",
                            "availabilityImpact": "NONE",
                            "privilegesRequired": "NONE",
                            "confidentialityImpact": "LOW"
                        }
                    },
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-04-27T13:58:23.511144Z",
                                "id": "CVE-2026-40557",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-04-30T15:21:01.170Z"
                }
            }
        ]
    }
}