Vulnerability-Lookup

CVE-2026-10143 (GCVE-0-2026-10143)

Vulnerability from cvelistv5 – Published: 2026-06-10 20:22 – Updated: 2026-11-08 14:00

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.

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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-11 13:10 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption
CWE-606 - Unchecked Input for Loop Condition

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7770 records in the last 180 days details

References

12 references

URL	Tags
https://github.com/dpkp/kafka-python/pull/3019	issue-trackingpatch
https://github.com/dpkp/kafka-python/commit/6e483…	patch
https://github.com/dpkp/kafka-python/pull/3026	issue-trackingpatch
https://www.vulncheck.com/advisories/kafka-python…	third-party-advisory
https://access.redhat.com/security/cve/CVE-2026-10143	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2487722	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:33683	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30076	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:42796	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:41066	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:28571	vendor-advisoryx_refsource_REDHAT

Impacted products

6 products

Vendor	Product	Version
Dana Powers	kafka-python	Affected: 0 , < 2.3.2 (git) cpe:2.3:a:dpkp:kafka-python::::::python::*
Red Hat	Red Hat Quay 3.10	Unaffected: 1782487717 , < * (rpm) cpe:/a:redhat:quay:3.10::el8
Red Hat	Red Hat Quay 3.12	Unaffected: 1781937357 , < * (rpm) cpe:/a:redhat:quay:3.12::el8
Red Hat	Red Hat Quay 3.15	Unaffected: 1784351966 , < * (rpm) cpe:/a:redhat:quay:3.15::el8
Red Hat	Red Hat Quay 3.16	Unaffected: 1783955846 , < * (rpm) cpe:/a:redhat:quay:3.16::el9
Red Hat	Red Hat Quay 3.9	Unaffected: 1781878070 , < * (rpm) cpe:/a:redhat:quay:3.9::el8

Date Public

2026-06-10 20:00

Credits

Katriel Moses

Show details on NVD website

JSON

To clipboard

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RHSA-2026:70267

Vulnerability from csaf_redhat - Published: 2026-09-22 14:59 - Updated: 2026-11-09 23:34

Summary

Red Hat Security Advisory: Red Hat Quay 3.14.9

Severity

Important

Scope

75 vulnerabilities in this advisory, including CVE-2026-10143.

CVE-2026-10143

A flaw was found in kafka-python. A malicious or machine-in-the-middle broker could exploit a denial-of-service vulnerability during SCRAM authentication. By providing an excessively large iteration count, the broker can cause the client's event loop to freeze. This prevents critical operations such as sending messages, polling for new messages, and maintaining heartbeats, ultimately leading to consumer group eviction and persistent connection failures.

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Fixed: 4 products Known not affected: 27 products

https://access.redhat.com/errata/RHSA-2026:70267

Open the full advisory

RHSA-2026:74511

Vulnerability from csaf_redhat - Published: 2026-10-01 14:57 - Updated: 2026-11-09 23:34

Summary

Red Hat Security Advisory: Red Hat Quay 3.17.5

Severity

Important

Scope

29 vulnerabilities in this advisory.

Open the full advisory

UBUNTU-CVE-2026-10143 (CVE-2026-10143)

Vulnerability from osv_ubuntu – Published: 2026-06-10 22:16 – Updated: 2026-10-17 09:37 – Source website

Details

Severity

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-10143	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-10143	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2487722	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-kafka",
            "binary_version": "0.9.3-2"
          },
          {
            "binary_name": "python3-kafka",
            "binary_version": "0.9.3-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "python-kafka",
        "purl": "pkg:deb/ubuntu/python-kafka@0.9.3-2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.9.3-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-kafka",
            "binary_version": "1.3.2-0ubuntu1"
          },
          {
            "binary_name": "python3-kafka",
            "binary_version": "1.3.2-0ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "python-kafka",
        "purl": "pkg:deb/ubuntu/python-kafka@1.3.2-0ubuntu1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.2-0ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-kafka",
            "binary_version": "1.4.6-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "python-kafka",
        "purl": "pkg:deb/ubuntu/python-kafka@1.4.6-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.3-1",
        "1.4.6-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-kafka",
            "binary_version": "2.0.2-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "python-kafka",
        "purl": "pkg:deb/ubuntu/python-kafka@2.0.2-2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.1-2",
        "2.0.2-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-kafka",
            "binary_version": "2.0.2-5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "python-kafka",
        "purl": "pkg:deb/ubuntu/python-kafka@2.0.2-5?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.2-4",
        "2.0.2-5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-kafka",
            "binary_version": "2.0.2-9"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "python-kafka",
        "purl": "pkg:deb/ubuntu/python-kafka@2.0.2-9?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.2-9"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-kafka",
            "binary_version": "2.0.2-12"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "python-kafka",
        "purl": "pkg:deb/ubuntu/python-kafka@2.0.2-12?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.2-11",
        "2.0.2-12"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-kafka",
            "binary_version": "2.0.2-11"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "python-kafka",
        "purl": "pkg:deb/ubuntu/python-kafka@2.0.2-11?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.2-9",
        "2.0.2-10",
        "2.0.2-11"
      ]
    }
  ],
  "aliases": [],
  "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": "UBUNTU-CVE-2026-10143",
  "modified": "2026-10-17T09:37:57Z",
  "published": "2026-06-10T22:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-10143"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-10143"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2487722"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "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: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"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-10143"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-10143 (GCVE-0-2026-10143)

RHSA-2026:70267

RHSA-2026:74511

UBUNTU-CVE-2026-10143 (CVE-2026-10143)

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Nomenclature

Vulnerability timeline

Related by attack behaviour