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This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.
Description
kafka-python prior to 2.3.2 contains a denial-of-service vulnerability in SCRAM authentication handling that allows a malicious or machine-in-the-middle broker to freeze the client event loop by supplying an excessively large iteration count. In scram.py, ScramClient.process_server_first_message() passes the broker-controlled SCRAM iteration count directly to hashlib.pbkdf2_hmac() without validation, blocking producer sends, consumer polls, admin operations, and heartbeats, which can cause consumer group eviction and repeated reconnect failures.
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Title: kafka-python de Dana Powers, Description: kafka-python anterior a 2.3.2 contiene una vulnerabilidad de denegación de servicio en el manejo de la autenticación SCRAM que permite a un bróker malicioso o de máquina-en-el-medio congelar el bucle de eventos del cliente al proporcionar un recuento de iteraciones excesivamente grande. En scram.py, ScramClient.process_server_first_message() pasa el recuento de iteraciones SCRAM controlado por el bróker directamente a hashlib.pbkdf2_hmac() sin validación, bloqueando los envíos del productor, las encuestas del consumidor, las operaciones de administración y los latidos, lo que puede causar la expulsión del grupo de consumidores y fallos repetidos de reconexión.
CVE Modified by redhat-SADP7/22/2026 8:17:07 AM
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Reference
https://access.redhat.com/errata/RHSA-2026:42796
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Affected
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CVE Modified by redhat-SADP7/20/2026 8:17:52 AM
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Affected
[{"vendor":"Red Hat","product":"Red Hat Quay 3.10","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"quay/quay-rhel8","cpes":["cpe:/a:redhat:quay:3.10::el8"],"versions":[{"version":"1782487717","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat Quay 3.12","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"quay/quay-rhel8","cpes":["cpe:/a:redhat:quay:3.12::el8"],"versions":[{"version":"1781937357","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat Quay 3.16","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"quay/quay-rhel9","cpes":["cpe:/a:redhat:quay:3.16::el9"],"versions":[{"version":"1783955846","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat Quay 3.9","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"quay/quay-rhel8","cpes":["cpe:/a:redhat:quay:3.9::el8"],"versions":[{"version":"1781878070","lessThan":"*","versionType":"rpm","status":"unaffected"}]}]
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CVE Modified by redhat-SADP7/17/2026 9:17:53 AM
Action
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Reference
https://access.redhat.com/errata/RHSA-2026:41066
Changed
Affected
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CVE Modified by redhat-SADP7/14/2026 10:18:01 PM
Action
Type
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Affected
[{"vendor":"Red Hat","product":"Red Hat Quay 3.10","defaultStatus":"affected","cpes":["cpe:/a:redhat:quay:3.10::el8"]},{"vendor":"Red Hat","product":"Red Hat Quay 3.12","defaultStatus":"affected","cpes":["cpe:/a:redhat:quay:3.12::el8"]},{"vendor":"Red Hat","product":"Red Hat Quay 3.9","defaultStatus":"affected","cpes":["cpe:/a:redhat:quay:3.9::el8"]},{"vendor":"Red Hat","product":"Red Hat Quay 3","defaultStatus":"affected","cpes":["cpe:/a:redhat:quay:3"]}]
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CVE Modified by redhat-SADP7/01/2026 9:16:42 AM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:33683
Changed
Affected
[{"vendor":"Red Hat","product":"Red Hat Quay 3.12","defaultStatus":"affected","cpes":["cpe:/a:redhat:quay:3.12::el8"]},{"vendor":"Red Hat","product":"Red Hat Quay 3.9","defaultStatus":"affected","cpes":["cpe:/a:redhat:quay:3.9::el8"]},{"vendor":"Red Hat","product":"Red Hat Quay 3","defaultStatus":"affected","cpes":["cpe:/a:redhat:quay:3"]}]
[{"vendor":"Red Hat","product":"Red Hat Quay 3.10","defaultStatus":"affected","cpes":["cpe:/a:redhat:quay:3.10::el8"]},{"vendor":"Red Hat","product":"Red Hat Quay 3.12","defaultStatus":"affected","cpes":["cpe:/a:redhat:quay:3.12::el8"]},{"vendor":"Red Hat","product":"Red Hat Quay 3.9","defaultStatus":"affected","cpes":["cpe:/a:redhat:quay:3.9::el8"]},{"vendor":"Red Hat","product":"Red Hat Quay 3","defaultStatus":"affected","cpes":["cpe:/a:redhat:quay:3"]}]
[{"vendor":"Red Hat","product":"Red Hat Quay 3.12","defaultStatus":"affected","cpes":["cpe:/a:redhat:quay:3.12::el8"]},{"vendor":"Red Hat","product":"Red Hat Quay 3.9","defaultStatus":"affected","cpes":["cpe:/a:redhat:quay:3.9::el8"]},{"vendor":"Red Hat","product":"Red Hat Quay 3","defaultStatus":"affected","cpes":["cpe:/a:redhat:quay:3"]}]
VulnCheck: https://www.vulncheck.com/advisories/kafka-python-prior-to-dos-via-scram-iteration-count-in-scram-py Types: Patch, Third Party Advisory
New CVE Received from VulnCheck6/10/2026 6:16:55 PM
Action
Type
Old Value
New Value
Added
Description
kafka-python prior to 2.3.2 contains a denial-of-service vulnerability in SCRAM authentication handling that allows a malicious or machine-in-the-middle broker to freeze the client event loop by supplying an excessively large iteration count. In scram.py, ScramClient.process_server_first_message() passes the broker-controlled SCRAM iteration count directly to hashlib.pbkdf2_hmac() without validation, blocking producer sends, consumer polls, admin operations, and heartbeats, which can cause consumer group eviction and repeated reconnect failures.
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