{"id":"CVE-2026-41081","aliases":["GHSA-j2q8-xx3q-8fqh"],"url":"https://o3.security/vulnerability/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","published":"2026-04-27T13:10:45.886Z","modified":"2026-07-15T01:49:14.144525469Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.apache.storm:storm-client","fixedVersion":"2.8.7"}],"fix":null,"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:14.144525469Z"}}