Vulnerability-Lookup

GHSA-27QJ-9GVP-8RH9

Vulnerability from github – Published: 2026-03-19 18:31 – Updated: 2026-03-19 21:23

Summary

Packetbeat does not properly validate an array index in multiple protocol parser components

Details

Improper Validation of Array Index (CWE-129) in multiple protocol parser components in Packetbeat can lead Denial of Service via Input Data Manipulation (CAPEC-153). An attacker with the ability to send specially crafted, malformed network packets to a monitored network interface can trigger out-of-bounds read operations, resulting in application crashes or resource exhaustion. This requires the attacker to be positioned on the same network segment as the Packetbeat deployment or to control traffic routed to monitored interfaces.

Severity

5.7 (Medium)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/elastic/beats/v7"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.0.0-alpha2.0.20260126223743-dec1b31111ec"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-26933"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-129"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-19T21:23:15Z",
    "nvd_published_at": "2026-03-19T18:16:21Z",
    "severity": "MODERATE"
  },
  "details": "Improper Validation of Array Index (CWE-129) in multiple protocol parser components in Packetbeat can lead Denial of Service via Input Data Manipulation (CAPEC-153). An attacker with the ability to send specially crafted, malformed network packets to a monitored network interface can trigger out-of-bounds read operations, resulting in application crashes or resource exhaustion. This requires the attacker to be positioned on the same network segment as the Packetbeat deployment or to control traffic routed to monitored interfaces.",
  "id": "GHSA-27qj-9gvp-8rh9",
  "modified": "2026-03-19T21:23:15Z",
  "published": "2026-03-19T18:31:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26933"
    },
    {
      "type": "WEB",
      "url": "https://github.com/elastic/beats/commit/941098459db6556b837194f40c076b08d51137cb"
    },
    {
      "type": "WEB",
      "url": "https://github.com/elastic/beats/commit/dec1b31111ec3500b82db21ba67dde5c914ee94d"
    },
    {
      "type": "WEB",
      "url": "https://discuss.elastic.co/t/packetbeat-8-19-11-9-2-5-security-update-esa-2026-11/385533"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/elastic/beats"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Packetbeat does not properly validate an array index in multiple protocol parser components"
}

CVE-2026-26933 (GCVE-0-2026-26933)

Vulnerability from cvelistv5 – Published: 2026-03-19 17:08 – Updated: 2026-03-19 17:52

Title

Improper Validation of Array Index in Packetbeat Leading to Denial of Service

Summary

Severity

5.7 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-19 17:52 UTC

CWE

CWE-129 - Improper Validation of Array Index

Assigner

elastic mitre root

References

1 reference

URL	Tags
https://discuss.elastic.co/t/packetbeat-8-19-11-9…

Impacted products

1 product

Vendor	Product	Version
Elastic	Packetbeat	Affected: 9.0.0 , ≤ 9.2.4 (semver) Affected: 8.0.0 , ≤ 8.19.10 (semver)

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JSON

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Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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.
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GHSA-27QJ-9GVP-8RH9

CVE-2026-26933 (GCVE-0-2026-26933)

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