CVE-2026-10143: Kafka python Denial of Service Vulnerability
HIGHCVE-2026-10143 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-606: Unchecked Input for Loop Condition) affecting Kafka python libraries in the PyPI ecosystem. The issue involves kafka-python vulnerable to denial of service through an unbounded scram iteration count. Remediation is available by upgrading affected packages to version 2.3.2.
CVE-2026-10143 at a Glance
Security Impact
CVSS: 7.5
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
How to Fix CVE-2026-10143
To remediate this vulnerability, upgrade all affected Kafka python dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
pip install kafka-python>=2.3.2Run the following command in your project directory to verify that all resolved dependencies use the patched release:
pip show kafka-pythonHow to Check if You Are Affected
To determine whether your Python environment is affected by CVE-2026-10143, inspect your installed packages using pip:
pip show kafka-pythonAnalyze the terminal output to locate any version of Kafka python in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.3.2), your application is affected.
Note: The pip show kafka-python command checks currently installed packages in your active Python environment.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-606: Unchecked Input for Loop Condition, where the product does not properly check inputs that are used for loop conditions, potentially leading to a denial of service or other consequences because of excessive looping. In Kafka python, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-10143 Affected Kafka python Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
kafka-python
|
PyPI |
< 2.3.2
|
2.3.2
|
References
Frequently Asked Questions
What is CVE-2026-10143?
Which Kafka python versions are affected?
What version fixes CVE-2026-10143?
Is kafka-python affected?
What is the CVSS score of CVE-2026-10143?
What CWE is associated with CVE-2026-10143?
How can I check PyPI dependencies for CVE-2026-10143?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-2jcm-hq8r-84wx",
"modified" : "2026-09-01T17:16:18Z",
"published" : "2026-06-11T00:32:04Z",
"aliases" : [ "CVE-2026-10143" ],
"summary" : "kafka-python vulnerable to denial of service through an unbounded SCRAM iteration count",
"details" : "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.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}, {
"type" : "CVSS_V4",
"score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "PyPI",
"name" : "kafka-python"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "2.3.2"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-10143"
}, {
"type" : "WEB",
"url" : "https://github.com/dpkp/kafka-python/pull/3026"
}, {
"type" : "WEB",
"url" : "https://github.com/dpkp/kafka-python/pull/3019"
}, {
"type" : "WEB",
"url" : "https://github.com/dpkp/kafka-python/commit/74400d7ef1b54ad24d4b8170c23b58d1cab65e4f"
}, {
"type" : "WEB",
"url" : "https://github.com/dpkp/kafka-python/commit/6e4831444f972d169cdd11f5c8d50333cea3f19b"
}, {
"type" : "WEB",
"url" : "https://www.vulncheck.com/advisories/kafka-python-prior-to-dos-via-scram-iteration-count-in-scram-py"
}, {
"type" : "WEB",
"url" : "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-10143.json"
}, {
"type" : "WEB",
"url" : "https://github.com/pypa/advisory-database/tree/main/vulns/kafka-python/PYSEC-2026-2191.yaml"
}, {
"type" : "WEB",
"url" : "https://github.com/dpkp/kafka-python/releases/tag/2.3.2"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/dpkp/kafka-python"
}, {
"type" : "WEB",
"url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2487722"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/security/cve/CVE-2026-10143"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2026:42796"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2026:41066"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2026:33683"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2026:30076"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/errata/RHSA-2026:28571"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-400", "CWE-606" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-09-01T17:16:18Z",
"nvd_published_at" : "2026-06-10T22:16:55Z"
}
}