PT-2026-48531 · Dana Powers · Kafka-Python

Katriel Moses · Published 2026-06-10 · Updated 2026-06-10 · CVE-2026-10143

Mitre

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Fix

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

CVE-2026-10143

Affected Products

Kafka-Python

References · 5

• https://github.com/dpkp/kafka-python/commit/6e4831444f972d169cdd11f5c8d50333cea3f19b · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-10143 · Security Note
• https://vulncheck.com/advisories/kafka-python-prior-to-dos-via-scram-iteration-count-in-scram-py · Note
• https://github.com/dpkp/kafka-python/pull/3026 · Note
• https://github.com/dpkp/kafka-python/pull/3019 · Note