---
id: CVE-2026-26933
aliases:
  - GHSA-27qj-9gvp-8rh9
  - GO-2026-4789
title: >-
  Packetbeat does not properly validate an array index in multiple protocol
  parser components
summary: >-
  Packetbeat does not properly validate an array index in multiple protocol
  parser components
severity: medium
cvss: 5.7
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
vendor: elastic
product: github.com/elastic/beats/v7
ecosystem: go
affected:
  - github.com/elastic/beats/v7 < 7.0.0-alpha2.0.20260126223743-dec1b31111ec
patched:
  - github.com/elastic/beats/v7 7.0.0-alpha2.0.20260126223743-dec1b31111ec
published: '2026-03-19'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:50:36.274896332Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-27qj-9gvp-8rh9'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-26933'
  - url: >-
      https://github.com/elastic/beats/commit/941098459db6556b837194f40c076b08d51137cb
  - url: >-
      https://github.com/elastic/beats/commit/dec1b31111ec3500b82db21ba67dde5c914ee94d
  - url: >-
      https://discuss.elastic.co/t/packetbeat-8-19-11-9-2-5-security-update-esa-2026-11/385533
  - url: 'https://github.com/elastic/beats'
tags:
  - osv
  - go
epss: 0.00239
epssPercentile: 0.15296
ingestedAt: '2026-09-12T03:13:01.744Z'
---

## Overview

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.

## Affected packages

- `github.com/elastic/beats/v7 < 7.0.0-alpha2.0.20260126223743-dec1b31111ec`

## Remediation

Upgrade to a patched release:

- `github.com/elastic/beats/v7 7.0.0-alpha2.0.20260126223743-dec1b31111ec`