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.

Affected: PyPI: kafka-python

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.

Affected: PyPI: kafka-python

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.

fast-uri: fast-uri: URI authority bypass due to improper delimiter handling shell-quote: shell-quote: Arbitrary code execution via command injection due to unescaped line terminators kafka-python: kafka-python: Denial of Service via excessive SCRAM authentication iteration count urllib3: urllib3: Denial of Service due to excessive HTTP response decompression axios: Axios: Client-side Denial of Service via unescaped regex metacharacters in XSRF cookie name python-pyjwt: PyJWT: Authentication bypass due to forged JSON Web Tokens

Affected: Ubuntu:16.04:LTS: python-kafka, Ubuntu:18.04:LTS: python-kafka, Ubuntu:20.04:LTS: python-kafka, Ubuntu:22.04:LTS: python-kafka, Ubuntu:24.04:LTS: python-kafka, Ubuntu:25.10: python-kafka, Ubuntu:26.04:LTS: python-kafka

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.