Apache Storm Client: Anonymous principal assigned on TLS client certificate verification failure

{
  "id": "90937b263168d5e54e32ccce633350919fb8da1c47fac68a81f0934201292197",
  "url": "https://osv.dev/vulnerability/CVE-2026-41081",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Apache Storm Client: Anonymous principal assigned on TLS client certificate verification failure",
    "summary": "Improper Handling of TLS Client Authentication Failure Leading to Anonymous Principal Assignment in Apache Storm Versions Affected: up to 2.8.7 Description: When TLS transport is enabled in Apache Storm without requiring client certificate authentication (the default configuration), the TlsTransportPlugin assigns a fallback principal (CN=ANONYMOUS) if no client certificate is presented or if certificate verification fails. The underlying SSLPeerUnverifiedException is caught and suppressed rather than rejecting the connection. This fail-open behavior means an unauthenticated client can establish a TLS connection and receive a valid principal identity. If the configured authorizer (e.g., SimpleACLAuthorizer) does not explicitly deny access to CN=ANONYMOUS, this may result in unauthorized access to Storm services. The condition is logged at debug level only, reducing visibility in production. Impact: Unauthenticated clients may be assigned a principal identity, potentially bypassing authorization in permissive or misconfigured environments. Mitigation: Users should upgrade to 2.8.7 in which TLS authentication failures are handled in a fail-closed manner. Users who cannot upgrade immediately should: - Enable mandatory client certificate authentication (nimbus.thrift.tls.client.auth.required: true) - Ensure authorization rules explicitly deny access to CN=ANONYMOUS - Review all ACL configurations for implicit default-allow behavior",
    "evidence": "osv:CVE-2026-41081",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-41081",
      "aliases": [
        "CVE-2026-41081",
        "GHSA-j2q8-xx3q-8fqh"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/apache/storm",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "db9cce52989123da301e401f4b7561848dd625af"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:apache:storm:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.8.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.8.5",
            "v2.8.4",
            "v2.8.3",
            "v2.8.2",
            "v2.8.1",
            "v2.8.0",
            "v2.7.1",
            "v2.7.0",
            "v2.6.4",
            "v2.6.3",
            "v2.6.1",
            "v2.5.0",
            "v2.0.0",
            "PRE_SECURITY_MERGE",
            "v0.9.3-rc1",
            "v0.9.2-incubating",
            "v0.9.1-incubating",
            "0.9.0.1",
            "0.9.0",
            "0.9.0-rc3",
            "0.9.0-rc2",
            "0.9.0-rc1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41081.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.904792720Z",
      "provider": "osv",
      "references": [
        "https://repo.maven.apache.org/maven2/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41081.json",
        "https://lists.apache.org/thread/plxx5l29dvplk5rwzdcq53rdfl6v4gs8",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-41081"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-287"
        ],
        "cna_assigner": "apache",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "2.8.7"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41081.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-41081",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 510969,
  "published_at": "2026-04-27T13:10:45.886+00:00"
}