CVE-2026-10143
kafka-python prior to 2.3.2 DoS via SCRAM Iteration Count in scram.py
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-400 |
| Vendor | dana powers |
| Product | kafka-python |
| Published | Jun 10, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Dana Powers / kafka-python
0 < 2.3.2
References
github.com: https://github.com/dpkp/kafka-python/pull/3019 github.com: https://github.com/dpkp/kafka-python/commit/6e4831444f972d169cdd11f5c8d50333cea3f19b github.com: https://github.com/dpkp/kafka-python/pull/3026 vulncheck.com: https://www.vulncheck.com/advisories/kafka-python-prior-to-dos-via-scram-iteration-count-in-scram-py
Credits
Katriel Moses