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CVE-2026-10143: CWE-400 Uncontrolled Resource Consumption in Dana Powers kafka-python

0
High
VulnerabilityCVE-2026-10143cvecve-2026-10143cwe-400
Published: 06/10/2026 (06/10/2026, 20:22:39 UTC)
Source: CVE Database V5
Vendor/Project: Dana Powers
Product: kafka-python

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.

CVSS v3.1

Score 7.5high

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected software

GitHub Actionsmore threats →cve
kafka-python
pkg:github/kafka-python
Affected versions
<2.3.2

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AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 07/15/2026, 08:26:00 UTC

Technical Analysis

CVE-2026-10143 is a denial-of-service vulnerability in kafka-python before version 2.3.2 related to SCRAM authentication handling. The vulnerability arises because the ScramClient.process_server_first_message() method passes the broker-controlled SCRAM iteration count directly to the hashlib.pbkdf2_hmac() function without validating its size. An attacker controlling or intercepting the broker can supply an excessively large iteration count, causing the client to spend excessive time computing the hash, effectively freezing the event loop. This impacts multiple client operations including producing, consuming, admin tasks, and heartbeats, which can result in consumer group eviction and repeated reconnect attempts.

Potential Impact

The vulnerability causes a denial-of-service condition by freezing the kafka-python client event loop. This disrupts normal client operations such as sending messages, polling for messages, performing administrative operations, and maintaining heartbeats. The disruption can lead to consumer group eviction and repeated reconnect failures, impacting availability of Kafka clients using affected versions.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The affected versions are kafka-python prior to 2.3.2. Users should upgrade to version 2.3.2 or later once available. Until a patch is confirmed, avoid connecting to untrusted brokers or networks where a man-in-the-middle could manipulate SCRAM iteration counts.

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Technical Details

Data Version
5.2
Assigner Short Name
VulnCheck
Date Reserved
2026-05-29T21:38:34.147Z
Cvss Version
3.1
State
PUBLISHED
Remediation Level
null
Vendor Advisory Urls
[{"url":"https://access.redhat.com/security/cve/CVE-2026-10143","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:30076","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:28571","vendor":"Red Hat"}]

Threat ID: 6a29d0220e53e738839869aa

Added to database: 06/10/2026, 20:59:14 UTC

Last enriched: 07/15/2026, 08:26:00 UTC

Last updated: 07/19/2026, 19:43:04 UTC

Views: 37

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