CVE-2026-10143

Name	CVE-2026-10143
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1139822

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
python-kafka (PTS)	bullseye	2.0.1-2	vulnerable
	bookworm	2.0.2-3	vulnerable
	trixie	2.0.2-9	vulnerable
	forky, sid	2.0.2-12	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
python-kafka	source	(unstable)	2.0.2-12			1139822

Notes

[trixie] - python-kafka <no-dsa> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=2487722
https://github.com/dpkp/kafka-python/pull/3019
https://github.com/dpkp/kafka-python/pull/3026
Fixed by: https://github.com/dpkp/kafka-python/commit/6e4831444f972d169cdd11f5c8d50333cea3f19b (3.0.0)