kafka-python prior to 2.3.2 DoS via SCRAM Iteration Count in scram.py

{
  "id": "c11ab2fb2f586e8a0ec0334d46b83c5e97d00745880534d7f10a0d5e82f577fd",
  "url": "https://osv.dev/vulnerability/CVE-2026-10143",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "kafka-python prior to 2.3.2 DoS via SCRAM Iteration Count in scram.py",
    "summary": "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.",
    "evidence": "osv:CVE-2026-10143",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-10143",
      "aliases": [
        "CVE-2026-10143",
        "GHSA-2jcm-hq8r-84wx",
        "PYSEC-2026-2191"
      ],
      "metrics": [
        {
          "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": [
        {
          "ranges": [
            {
              "repo": "https://github.com/dpkp/kafka-python",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "054b570c971f6747aeb01a130d80f7d156152e13"
                },
                {
                  "fixed": "6e4831444f972d169cdd11f5c8d50333cea3f19b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:dpkp:kafka-python:*:*:*:*:*:python:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.3.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "6e4831444f972d169cdd11f5c8d50333cea3f19b"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.3.1",
            "2.3.0",
            "2.2.13",
            "2.2.12",
            "2.2.11",
            "2.2.10",
            "2.2.9",
            "2.2.8",
            "2.2.7",
            "2.2.6",
            "2.2.5",
            "2.2.4",
            "2.2.3",
            "2.1.5",
            "2.2.2",
            "2.2.1",
            "2.2.0",
            "2.1.4",
            "2.1.3",
            "2.1.2",
            "2.1.1",
            "2.1.0",
            "2.0.5",
            "2.0.4",
            "2.0.3",
            "2.0.2",
            "2.0.1",
            "2.0.0",
            "1.4.7",
            "1.4.6",
            "1.4.5",
            "1.4.4",
            "1.4.3",
            "1.4.2",
            "1.4.1",
            "1.4.0",
            "1.3.5",
            "1.3.4",
            "1.3.3",
            "1.3.2",
            "1.3.1",
            "1.3.0",
            "1.2.5",
            "1.2.4",
            "1.2.3",
            "1.2.2",
            "1.2.1",
            "1.2.0",
            "1.1.1",
            "1.1.0",
            "1.0.2",
            "1.0.1",
            "1.0.0",
            "v0.9.5",
            "v0.9.4",
            "v0.9.3",
            "v0.9.2",
            "v0.9.1",
            "v0.9.0",
            "v0.8.0",
            "0.1-alpha"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-10143.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.187846417Z",
      "provider": "osv",
      "references": [
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-10143.json",
        "https://access.redhat.com/errata/RHSA-2026:28571",
        "https://access.redhat.com/errata/RHSA-2026:30076",
        "https://access.redhat.com/errata/RHSA-2026:33683",
        "https://access.redhat.com/errata/RHSA-2026:41066",
        "https://access.redhat.com/errata/RHSA-2026:42796",
        "https://access.redhat.com/security/cve/CVE-2026-10143",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10143.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-10143",
        "https://www.vulncheck.com/advisories/kafka-python-prior-to-dos-via-scram-iteration-count-in-scram-py",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2487722",
        "https://github.com/dpkp/kafka-python/pull/3019",
        "https://github.com/dpkp/kafka-python/pull/3026",
        "https://github.com/dpkp/kafka-python/commit/6e4831444f972d169cdd11f5c8d50333cea3f19b",
        "https://github.com/dpkp/kafka-python"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-400"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10143.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-10143",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 489452,
  "published_at": "2026-06-10T20:22:39.262+00:00"
}