{"id":"CVE-2026-41081","summary":"Apache Storm Client: Anonymous principal assigned on TLS client certificate verification failure","details":"Improper Handling of TLS Client Authentication Failure Leading to Anonymous Principal Assignment in Apache Storm\n\nVersions Affected: up to 2.8.7\n\nDescription: 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.\n\nThis 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.\n\nImpact: Unauthenticated clients may be assigned a principal identity, potentially bypassing authorization in permissive or misconfigured environments.\n\nMitigation: Users should upgrade to 2.8.7 in which TLS authentication failures are handled in a fail-closed manner.\n\nUsers who cannot upgrade immediately should:\n- Enable mandatory client certificate authentication (nimbus.thrift.tls.client.auth.required: true)\n- Ensure authorization rules explicitly deny access to CN=ANONYMOUS\n- Review all ACL configurations for implicit default-allow behavior","aliases":["GHSA-j2q8-xx3q-8fqh"],"modified":"2026-08-12T03:51:14.545904806Z","published":"2026-04-27T13:10:45.886Z","database_specific":{"unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"fixed":"2.8.7"}]}],"cna_assigner":"apache","cwe_ids":["CWE-287"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41081.json"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/04/25/3"},{"type":"WEB","url":"https://repo.maven.apache.org/maven2/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41081.json"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/plxx5l29dvplk5rwzdcq53rdfl6v4gs8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41081"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/storm","events":[{"introduced":"0"},{"fixed":"db9cce52989123da301e401f4b7561848dd625af"}],"database_specific":{"source":"CPE_RANGE","cpe":"cpe:2.3:a:apache:storm:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"2.8.7"}]}}],"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"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"}]}