{"schemaVersion":3,"id":"CVE-2026-41081","aliases":["GHSA-j2q8-xx3q-8fqh"],"status":"published","duplicateOf":null,"title":null,"description":"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 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2.8.7","eol":null,"hubHref":"/vendor/apache/storm"},{"vendor":"org.apache.storm","product":"storm-client","name":"org.apache.storm:storm-client","label":"storm-client","ecosystem":"Maven","cpePart":null,"purl":"pkg:maven/org.apache.storm/storm-client","purlType":"maven","versions":[{"text":"< 2.8.7","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.8.7","eol":null,"hubHref":null}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://lists.apache.org/thread/plxx5l29dvplk5rwzdcq53rdfl6v4gs8","label":"lists.apache.org/thread/plxx5l29dvplk5rwzdcq53rdfl6v4gs8","hostname":"lists.apache.org","tags":["Vendor Advisory","WEB","Mailing List"]},{"url":"http://www.openwall.com/lists/oss-security/2026/04/25/3","label":"www.openwall.com/lists/oss-security/2026/04/25/3","hostname":"www.openwall.com","tags":["WEB","Mailing List","Third Party 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