VULNERABILITY INTELLIGENCE

CVE-2026-10143

CVSS score8.7 HIGH
EPSS probability0.52%
CISA KEVNot currently listed
Published2026-06-10
Last modified2026-10-08
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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.

Weakness classification

  • CWE-400: Uncontrolled Resource Consumption
  • CWE-606: Unchecked Input for Loop Condition

Primary references