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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: 07/22/2026, 21:52:50 UTC

Technical Analysis

The vulnerability in kafka-python (CVE-2026-10143) arises from improper validation of the SCRAM iteration count in the SCRAM authentication process. Specifically, the ScramClient.process_server_first_message() method passes the broker-controlled iteration count directly to the hashlib.pbkdf2_hmac() function without validation. An attacker controlling or intercepting the broker can supply an excessively large iteration count, causing uncontrolled resource consumption that freezes the client event loop. This denial-of-service condition affects multiple client operations including producing, consuming, admin tasks, and heartbeat signals, which can disrupt consumer group stability and cause repeated reconnection attempts.

Potential Impact

This vulnerability results in a denial-of-service condition for kafka-python clients using SCRAM authentication. The client event loop can be frozen, blocking critical operations such as sending messages, polling consumers, performing admin operations, and sending heartbeats. This can cause consumer group eviction and repeated reconnect failures, impacting availability of Kafka clients relying on vulnerable versions.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The Red Hat advisories linked do not explicitly confirm a fix for kafka-python itself but provide related errata for Red Hat products. Users should monitor the official kafka-python project and vendor advisories for an official fix or update to version 2.3.2 or later. Until a fix is applied, avoid connecting to untrusted brokers or networks where a malicious broker could exploit this vulnerability.

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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: 07/22/2026, 21:52:50 UTC

Last updated: 07/24/2026, 08:52:02 UTC

Views: 39

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