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GHSA-2JCM-HQ8R-84WX

Vulnerability from github – Published: 2026-06-11 00:32 – Updated: 2026-09-01 17:16
VLAI
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
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7 (High)
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
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "kafka-python"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.3.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-10143"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-606"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-01T17:16:18Z",
    "nvd_published_at": "2026-06-10T22:16:55Z",
    "severity": "HIGH"
  },
  "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.",
  "id": "GHSA-2jcm-hq8r-84wx",
  "modified": "2026-09-01T17:16:18Z",
  "published": "2026-06-11T00:32:04Z",
  "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "kafka-python vulnerable to denial of service through an unbounded SCRAM iteration count"
}



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