CVE-2026-10143

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.processserverfirstmessage() passes the broker-controlled SCRAM iteration count directly to hashlib.pbkdf2hmac() without validation, blocking producer sends, consumer polls, admin operations, and heartbeats, which can cause consumer group eviction and repeated reconnect failures.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10143.json",
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-400"
    ]
}

References

Affected packages

Git / github.com/dpkp/kafka-python

Affected ranges

Type

GIT

Repo

https://github.com/dpkp/kafka-python

Events

Introduced

Fixed

054b570c971f6747aeb01a130d80f7d156152e13

Fixed

6e4831444f972d169cdd11f5c8d50333cea3f19b

Database specific

{
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:dpkp:kafka-python:*:*:*:*:*:python:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.3.2"
        }
    ]
}

Affected versions

0.*

0.1-alpha

1.*

1.0.0

1.0.1

1.0.2

1.1.0

1.1.1

1.2.0

1.2.1

1.2.2

1.2.3

1.2.4

1.2.5

1.3.0

1.3.1

1.3.2

1.3.3

1.3.4

1.3.5

1.4.0

1.4.1

1.4.2

1.4.3

1.4.4

1.4.5

1.4.6

1.4.7

2.*

2.0.0

2.0.1

2.0.2

2.0.3

2.0.4

2.0.5

2.1.0

2.1.1

2.1.2

2.1.3

2.1.4

2.1.5

2.2.0

2.2.1

2.2.10

2.2.11

2.2.12

2.2.13

2.2.2

2.2.3

2.2.4

2.2.5

2.2.6

2.2.7

2.2.8

2.2.9

2.3.0

2.3.1

v0.*

v0.8.0

v0.9.0

v0.9.1

v0.9.2

v0.9.3

v0.9.4

v0.9.5

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-10143.json"