CVE-2026-41081 (GCVE-0-2026-41081)
Vulnerability from cvelistv5 – Published: 2026-04-27 13:10 – Updated: 2026-04-27 14:43
VLAI?
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
Severity ?
No CVSS data available.
CWE
- CWE-287 - Improper Authentication
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Apache Software Foundation | Apache Storm Client |
Affected:
0 , < 2.8.7
(semver)
|
Credits
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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