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    <lastBuildDate>Mon, 12 Oct 2026 22:44:41 +0000</lastBuildDate>
    <item>
      <title>CVE-2026-41081 — Apache Storm Client: Anonymous principal assigned on TLS client certificate verification failure</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-41081</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Apache Software Foundation Apache Storm Client&lt;/p&gt;
&lt;p&gt;Improper Handling of TLS Client Authentication Failure Leading to Anonymous Principal Assignment in Apache Storm&lt;/p&gt;
&lt;p&gt;Versions Affected: up to 2.8.7&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;Impact: Unauthenticated clients may be assigned a principal identity, potentially bypassing authorization in permissive or misconfigured environments.&lt;/p&gt;
&lt;p&gt;Mitigation: Users should upgrade to 2.8.7 in which TLS authentication failures are handled in a fail-closed manner.&lt;/p&gt;
&lt;p&gt;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&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Apache Software Foundation Apache Storm Client&lt;/p&gt;
&lt;p&gt;Improper Handling of TLS Client Authentication Failure Leading to Anonymous Principal Assignment in Apache Storm&lt;/p&gt;
&lt;p&gt;Versions Affected: up to 2.8.7&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;Impact: Unauthenticated clients may be assigned a principal identity, potentially bypassing authorization in permissive or misconfigured environments.&lt;/p&gt;
&lt;p&gt;Mitigation: Users should upgrade to 2.8.7 in which TLS authentication failures are handled in a fail-closed manner.&lt;/p&gt;
&lt;p&gt;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&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2026-41081</guid>
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