Apache Kafka Critical Auth Bypass Vulnerability CVE-2026-33557 Affects Versions 4.1.x
Summary
CSIRT-ITA has issued Alert AL07/260422/CSIRT-ITA disclosing a critical authentication bypass vulnerability (CVE-2026-33557) in Apache Kafka affecting versions 4.1.x and earlier. The vulnerability, rated with a high systemic impact score of 65.51, could allow an attacker to circumvent authentication mechanisms of the open-source stream-processing platform. The advisory recommends immediate application of the latest security patches provided by the vendor. CVE-2026-33557 is catalogued at the NVD with references to the Apache Kafka project mailing list for additional detail.
“Tale vulnerabilità, qualora sfruttata, potrebbe consentire ad un utente malintenzionato di eludere i meccanismi di autenticazione.”
Organisations operating Apache Kafka 4.1.x or earlier in production should treat this as a Priority review item — the authentication bypass vector means unauthenticated attackers could gain access to data streams and processing pipelines. Verify Kafka broker and client authentication configurations and confirm that patches are applied as soon as feasible.
About this source
GovPing monitors Italy CSIRT Advisories for new data privacy & cybersecurity regulatory changes. Every update since tracking began is archived, classified, and available as free RSS or email alerts — 3 changes logged to date.
What changed
CSIRT-ITA published a cybersecurity alert disclosing CVE-2026-33557, a critical authentication bypass vulnerability in Apache Kafka. Versions 4.1.x through 4.1.1 and all prior 4.1.x releases are affected. The vulnerability carries a high systemic impact score of 65.51 and could enable a malicious user to circumvent authentication controls of the platform.
Organisations running Apache Kafka deployments should assess exposure immediately and apply the most recent security patches issued by the Apache Kafka project. Failure to remediate could expose data streams and real-time data-processing infrastructure to unauthorised access. Security teams should monitor NVD and the Apache Kafka project mailing list for updated patch information.
What to do next
- Ove non già provveduto, si raccomanda l'applicazione delle patch di sicurezza più recenti fornite dal produttore.
Archived snapshot
Apr 23, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
Vulnerabilità in Apache Kafka
**
Alert**
AL07/260422/CSIRT-ITA
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Sintesi
Rilevate due nuove vulnerabilità, di cui una con gravità “critica” in Apache Kafka, piattaforma open-source distribuita per lo stream processing e la gestione di flussi di dati in tempo reale. Tale vulnerabilità, qualora sfruttata, potrebbe consentire ad un utente malintenzionato di eludere i meccanismi di autenticazione.
Tipologia
- Authentication Bypass
Prodotti e/o versioni affette
Apache Kafka
- 4.1.x, versione 4.1.1 e precedenti
Azioni di mitigazione
Ove non già provveduto, si raccomanda l’applicazione delle patch di sicurezza più recenti fornite dal produttore.
CVE (1)
Cerca:
| CVE | POC | EXPLOITATION |
| --- | --- | --- |
| CVE-2026-33557 | - | - |
Riferimenti (2)
- https://nvd.nist.gov/vuln/detail/CVE-2026-33557
- https://lists.apache.org/thread/v57o00hm6yszdpdnvqx2ss4561yh953h
Change log
| Versione | Note | Data |
|---|---|---|
| 1.0 | Pubblicato il 22-04-2026 | 22/04/2026 |
Impatto sistemico
Alto (65.51)
Argomenti
Data pubblicazione
22/04/26 ore 17:03
Data Ultimo Aggiornamento
22/04/26 ore 17:03
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Source document text, dates, docket IDs, and authority are extracted directly from CSIRT-ITA.
The summary, classification, recommended actions, deadlines, and penalty information are AI-generated from the original text and may contain errors. Always verify against the source document.
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