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.
History

Thu, 11 Jun 2026 19:15:00 +0000

Type Values Removed Values Added
First Time appeared Dpkp
Dpkp kafka-python
CPEs cpe:2.3:a:dpkp:kafka-python:*:*:*:*:*:python:*:*
Vendors & Products Dpkp
Dpkp kafka-python

Thu, 11 Jun 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 11 Jun 2026 10:45:00 +0000

Type Values Removed Values Added
First Time appeared Dana Powers
Dana Powers kafka-python
Vendors & Products Dana Powers
Dana Powers kafka-python

Thu, 11 Jun 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-606
References
Metrics threat_severity

None

threat_severity

Important


Wed, 10 Jun 2026 21:00:00 +0000

Type Values Removed Values 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.
Title kafka-python prior to 2.3.2 DoS via SCRAM Iteration Count in scram.py
Weaknesses CWE-400
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-06-10T20:22:39.262Z

Updated: 2026-06-11T13:24:52.138Z

Reserved: 2026-05-29T21:38:34.147Z

Link: CVE-2026-10143

cve-icon Vulnrichment

Updated: 2026-06-11T13:22:30.326Z

cve-icon NVD

Status : Analyzed

Published: 2026-06-10T22:16:55.503

Modified: 2026-06-11T19:11:01.180

Link: CVE-2026-10143

cve-icon Redhat

Severity : Important

Publid Date: 2026-06-10T20:22:39Z

Links: CVE-2026-10143 - Bugzilla