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 suppl
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | kafka-python | < 2.3.2 | 2.3.2 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-10143
- https://github.com/dpkp/kafka-python/pull/3026
- https://github.com/dpkp/kafka-python/pull/3019
- https://github.com/dpkp/kafka-python/commit/74400d7ef1b54ad24d4b8170c23b58d1cab65e4f
- https://github.com/dpkp/kafka-python/commit/6e4831444f972d169cdd11f5c8d50333cea3f19b
- https://www.vulncheck.com/advisories/kafka-python-prior-to-dos-via-scram-iteration-count-in-scram-py
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-10143.json
- https://github.com/pypa/advisory-database/tree/main/vulns/kafka-python/PYSEC-2026-2191.yaml
- https://github.com/dpkp/kafka-python/releases/tag/2.3.2
- https://github.com/dpkp/kafka-python
- https://bugzilla.redhat.com/show_bug.cgi?id=2487722
- https://access.redhat.com/security/cve/CVE-2026-10143
- https://access.redhat.com/errata/RHSA-2026:42796
- https://access.redhat.com/errata/RHSA-2026:41066
- https://access.redhat.com/errata/RHSA-2026:33683
- https://access.redhat.com/errata/RHSA-2026:30076
- https://access.redhat.com/errata/RHSA-2026:28571
- https://github.com/advisories/GHSA-2jcm-hq8r-84wx
- CVSS vector
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/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- Weakness (CWE)
CWE-400, CWE-606- Platform
- Python (PyPI)
- Package
kafka-python- Disclosed
- 10.06.2026
- Updated
- 11.10.2026 15:18
Sources and licenses
OSV / GitHub Advisory Database - GHSA-2jcm-hq8r-84wx - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-2191 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: kafka-python
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 06.2026 06.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
Disclosures per year
- 2026: 2
-
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 suppl this entry
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