8.7
HIGH
CVSS 4.0
CVE-2026-10143
kafka-python prior to 2.3.2 DoS via SCRAM Iteration Count in scram.py
Overview
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.
Details
INFO
Published Date :
June 10, 2026, 10:16 p.m.
Last Modified :
July 23, 2026, 9:10 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
Update kafka-python to version 2.3.2 or later to fix the SCRAM authentication denial-of-service.
- Update kafka-python to version 2.3.2 or later.
- Validate SCRAM iteration counts in authentication.
- Monitor client event loop for freezes.
- Restart affected clients if necessary.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-10143.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-10143 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-10143
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-10143 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-10143 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added Translation Title: kafka-python de Dana Powers, Description: kafka-python anterior a 2.3.2 contiene una vulnerabilidad de denegación de servicio en el manejo de la autenticación SCRAM que permite a un bróker malicioso o de máquina-en-el-medio congelar el bucle de eventos del cliente al proporcionar un recuento de iteraciones excesivamente grande. En scram.py, ScramClient.process_server_first_message() pasa el recuento de iteraciones SCRAM controlado por el bróker directamente a hashlib.pbkdf2_hmac() sin validación, bloqueando los envíos del productor, las encuestas del consumidor, las operaciones de administración y los latidos, lo que puede causar la expulsión del grupo de consumidores y fallos repetidos de reconexión. -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jul. 22, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:42796 Changed Affected [{'cpes': ['cpe:/a:redhat:quay:3.10::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.1', 'versions': [{'status': 'unaffected', 'version': '1782487717', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.12::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.12', 'versions': [{'status': 'unaffected', 'version': '1781937357', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.16::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.16', 'versions': [{'status': 'unaffected', 'version': '1783955846', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel9', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.9::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.9', 'versions': [{'status': 'unaffected', 'version': '1781878070', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}] [{'cpes': ['cpe:/a:redhat:quay:3.10::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.1', 'versions': [{'status': 'unaffected', 'version': '1782487717', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.12::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.12', 'versions': [{'status': 'unaffected', 'version': '1781937357', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.15::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.15', 'versions': [{'status': 'unaffected', 'version': '1784351966', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.16::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.16', 'versions': [{'status': 'unaffected', 'version': '1783955846', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel9', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.9::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.9', 'versions': [{'status': 'unaffected', 'version': '1781878070', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}] -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jul. 20, 2026
Action Type Old Value New Value Changed Affected [{'cpes': ['cpe:/a:redhat:quay:3.10::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.10', 'versions': [{'status': 'unaffected', 'version': '1782487717', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.12::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.12', 'versions': [{'status': 'unaffected', 'version': '1781937357', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.16::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.16', 'versions': [{'status': 'unaffected', 'version': '1783955846', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel9', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.9::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.9', 'versions': [{'status': 'unaffected', 'version': '1781878070', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}] [{'cpes': ['cpe:/a:redhat:quay:3.10::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.1', 'versions': [{'status': 'unaffected', 'version': '1782487717', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.12::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.12', 'versions': [{'status': 'unaffected', 'version': '1781937357', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.16::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.16', 'versions': [{'status': 'unaffected', 'version': '1783955846', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel9', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.9::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.9', 'versions': [{'status': 'unaffected', 'version': '1781878070', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}] -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jul. 17, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:41066 Changed Affected [{'cpes': ['cpe:/a:redhat:quay:3.10::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.10', 'versions': [{'status': 'unaffected', 'version': '1782487717', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.12::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.12', 'versions': [{'status': 'unaffected', 'version': '1781937357', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.9::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.9', 'versions': [{'status': 'unaffected', 'version': '1781878070', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3', 'packageName': 'quay/quay-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}] [{'cpes': ['cpe:/a:redhat:quay:3.10::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.10', 'versions': [{'status': 'unaffected', 'version': '1782487717', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.12::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.12', 'versions': [{'status': 'unaffected', 'version': '1781937357', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.16::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.16', 'versions': [{'status': 'unaffected', 'version': '1783955846', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel9', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.9::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.9', 'versions': [{'status': 'unaffected', 'version': '1781878070', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}] -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jul. 15, 2026
Action Type Old Value New Value Changed Affected [{'cpes': ['cpe:/a:redhat:quay:3.10::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.10', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.12::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.12', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.9::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3', 'defaultStatus': 'affected'}] [{'cpes': ['cpe:/a:redhat:quay:3.10::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.10', 'versions': [{'status': 'unaffected', 'version': '1782487717', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.12::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.12', 'versions': [{'status': 'unaffected', 'version': '1781937357', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.9::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.9', 'versions': [{'status': 'unaffected', 'version': '1781878070', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'quay/quay-rhel8', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3', 'packageName': 'quay/quay-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}] -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jul. 01, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:33683 Changed Affected [{'cpes': ['cpe:/a:redhat:quay:3.12::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.12', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.9::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3', 'defaultStatus': 'affected'}] [{'cpes': ['cpe:/a:redhat:quay:3.10::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.10', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.12::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.12', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.9::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3', 'defaultStatus': 'affected'}] -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jun. 30, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:/a:redhat:quay:3.12::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.12', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3.9::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3.9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:quay:3'], 'vendor': 'Red Hat', 'product': 'Red Hat Quay 3', 'defaultStatus': 'affected'}] Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-606 Added Reference https://access.redhat.com/errata/RHSA-2026:28571 Added Reference https://access.redhat.com/errata/RHSA-2026:30076 Added Reference https://access.redhat.com/security/cve/CVE-2026-10143 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2487722 Added Reference https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-10143.json -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-10143', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-11T13:10:04.299411Z'} -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Dana Powers', 'product': 'kafka-python', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2.3.2', 'versionType': 'git'}], 'collectionURL': 'https://github.com/dpkp/kafka-python', 'defaultStatus': 'unknown'}] -
Initial Analysis by [email protected]
Jun. 11, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:dpkp:kafka-python:*:*:*:*:*:python:*:* versions up to (excluding) 2.3.2 Added Reference Type VulnCheck: https://github.com/dpkp/kafka-python/commit/6e4831444f972d169cdd11f5c8d50333cea3f19b Types: Patch Added Reference Type VulnCheck: https://github.com/dpkp/kafka-python/pull/3019 Types: Issue Tracking, Patch Added Reference Type VulnCheck: https://github.com/dpkp/kafka-python/pull/3026 Types: Issue Tracking, Patch Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/kafka-python-prior-to-dos-via-scram-iteration-count-in-scram-py Types: Patch, Third Party Advisory -
New CVE Received by [email protected]
Jun. 10, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-400 Added Reference https://github.com/dpkp/kafka-python/commit/6e4831444f972d169cdd11f5c8d50333cea3f19b Added Reference https://github.com/dpkp/kafka-python/pull/3019 Added Reference https://github.com/dpkp/kafka-python/pull/3026 Added Reference https://www.vulncheck.com/advisories/kafka-python-prior-to-dos-via-scram-iteration-count-in-scram-py
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.