Vulnerability Details CVE-2026-10143
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 21.2%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-10143
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cpe:2.3:a:dpkp:kafka-python:0.1
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cpe:2.3:a:dpkp:kafka-python:0.8.0
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cpe:2.3:a:dpkp:kafka-python:0.9.0
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cpe:2.3:a:dpkp:kafka-python:0.9.1
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cpe:2.3:a:dpkp:kafka-python:0.9.2
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cpe:2.3:a:dpkp:kafka-python:0.9.3
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cpe:2.3:a:dpkp:kafka-python:0.9.4
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cpe:2.3:a:dpkp:kafka-python:0.9.5
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cpe:2.3:a:dpkp:kafka-python:1.0.0
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cpe:2.3:a:dpkp:kafka-python:1.0.1
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cpe:2.3:a:dpkp:kafka-python:1.0.2
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cpe:2.3:a:dpkp:kafka-python:1.1.0
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cpe:2.3:a:dpkp:kafka-python:1.1.1
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cpe:2.3:a:dpkp:kafka-python:1.2.0
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cpe:2.3:a:dpkp:kafka-python:1.2.1
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cpe:2.3:a:dpkp:kafka-python:1.2.2
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cpe:2.3:a:dpkp:kafka-python:1.2.3
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cpe:2.3:a:dpkp:kafka-python:1.2.4
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cpe:2.3:a:dpkp:kafka-python:1.2.5
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cpe:2.3:a:dpkp:kafka-python:1.3.0
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cpe:2.3:a:dpkp:kafka-python:1.3.1
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cpe:2.3:a:dpkp:kafka-python:1.3.2
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cpe:2.3:a:dpkp:kafka-python:1.3.3
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cpe:2.3:a:dpkp:kafka-python:1.3.4
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cpe:2.3:a:dpkp:kafka-python:1.3.5
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cpe:2.3:a:dpkp:kafka-python:1.4.0
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cpe:2.3:a:dpkp:kafka-python:1.4.1
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cpe:2.3:a:dpkp:kafka-python:1.4.2
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cpe:2.3:a:dpkp:kafka-python:1.4.3
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cpe:2.3:a:dpkp:kafka-python:1.4.4
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cpe:2.3:a:dpkp:kafka-python:1.4.5
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cpe:2.3:a:dpkp:kafka-python:1.4.6
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cpe:2.3:a:dpkp:kafka-python:1.4.7
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cpe:2.3:a:dpkp:kafka-python:2.0.0
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cpe:2.3:a:dpkp:kafka-python:2.0.1
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cpe:2.3:a:dpkp:kafka-python:2.0.2
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cpe:2.3:a:dpkp:kafka-python:2.0.3
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cpe:2.3:a:dpkp:kafka-python:2.0.4
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cpe:2.3:a:dpkp:kafka-python:2.0.5
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cpe:2.3:a:dpkp:kafka-python:2.0.6
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cpe:2.3:a:dpkp:kafka-python:2.1.0
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cpe:2.3:a:dpkp:kafka-python:2.1.1
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cpe:2.3:a:dpkp:kafka-python:2.1.2
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cpe:2.3:a:dpkp:kafka-python:2.1.3
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cpe:2.3:a:dpkp:kafka-python:2.1.4
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cpe:2.3:a:dpkp:kafka-python:2.1.5
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cpe:2.3:a:dpkp:kafka-python:2.1.6
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cpe:2.3:a:dpkp:kafka-python:2.2.0
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cpe:2.3:a:dpkp:kafka-python:2.2.1
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cpe:2.3:a:dpkp:kafka-python:2.2.10
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cpe:2.3:a:dpkp:kafka-python:2.2.11
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cpe:2.3:a:dpkp:kafka-python:2.2.12
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cpe:2.3:a:dpkp:kafka-python:2.2.13
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cpe:2.3:a:dpkp:kafka-python:2.2.14
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cpe:2.3:a:dpkp:kafka-python:2.2.15
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cpe:2.3:a:dpkp:kafka-python:2.2.16
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cpe:2.3:a:dpkp:kafka-python:2.2.17
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cpe:2.3:a:dpkp:kafka-python:2.2.18
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cpe:2.3:a:dpkp:kafka-python:2.2.19
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cpe:2.3:a:dpkp:kafka-python:2.2.2
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cpe:2.3:a:dpkp:kafka-python:2.2.20
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cpe:2.3:a:dpkp:kafka-python:2.2.3
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cpe:2.3:a:dpkp:kafka-python:2.2.4
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cpe:2.3:a:dpkp:kafka-python:2.2.5
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cpe:2.3:a:dpkp:kafka-python:2.2.6
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cpe:2.3:a:dpkp:kafka-python:2.2.7
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cpe:2.3:a:dpkp:kafka-python:2.2.8
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cpe:2.3:a:dpkp:kafka-python:2.2.9
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cpe:2.3:a:dpkp:kafka-python:2.3.0
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cpe:2.3:a:dpkp:kafka-python:2.3.1