---
id: CVE-2025-68383
aliases:
  - GHSA-2mj3-6grc-px38
  - GO-2025-4252
title: >-
  Filebeat Beats has Buffer Overflow via Malformed Syslog Message or Malicious
  Tokenizer Pattern in Dissect Configuration
summary: >-
  Filebeat Beats has Buffer Overflow via Malformed Syslog Message or Malicious
  Tokenizer Pattern in Dissect Configuration
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/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 >= 7.7.0, < 8.19.9'
  - 'github.com/elastic/beats/v7 >= 9.0.0, < 9.1.9'
  - 'github.com/elastic/beats/v7 >= 9.2.0, < 9.2.3'
  - github.com/elastic/beats/v7 < 7.0.0-alpha2.0.20251204214633-dd3af18220bf
  - github.com/elastic/beats <= 7.6.2
patched:
  - github.com/elastic/beats/v7 8.19.9
  - github.com/elastic/beats/v7 9.1.9
  - github.com/elastic/beats/v7 9.2.3
  - github.com/elastic/beats/v7 7.0.0-alpha2.0.20251204214633-dd3af18220bf
published: '2025-12-19'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:50:31.294125666Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-2mj3-6grc-px38'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-68383'
  - url: >-
      https://github.com/elastic/beats/commit/27a168fb1c598d4a16748e9a7382bc0d197335a5
  - url: >-
      https://github.com/elastic/beats/commit/2f971a057eea68e057b47829950cd8c26805df30
  - url: >-
      https://github.com/elastic/beats/commit/339fa3f887a14c91e0c955b50a3b8819393bd632
  - url: >-
      https://discuss.elastic.co/t/filebeat-8-19-9-9-1-9-and-9-2-3-security-update-esa-2025-32/384180
  - url: 'https://github.com/elastic/elasticsearch'
tags:
  - osv
  - go
epss: 0.00191
epssPercentile: 0.07758
ingestedAt: '2026-09-12T03:13:01.745Z'
---

## Overview

Improper Validation of Specified Index, Position, or Offset in Input (CWE-1285) in Filebeat Syslog parser and the Libbeat Dissect processor can allow a user to trigger a Buffer Overflow (CAPEC-100) and cause a denial of service (panic/crash) of the Filebeat process via either a malformed Syslog message or a malicious tokenizer pattern in the Dissect configuration.

## Affected packages

- `github.com/elastic/beats/v7 >= 7.7.0, < 8.19.9`
- `github.com/elastic/beats/v7 >= 9.0.0, < 9.1.9`
- `github.com/elastic/beats/v7 >= 9.2.0, < 9.2.3`
- `github.com/elastic/beats/v7 < 7.0.0-alpha2.0.20251204214633-dd3af18220bf`
- `github.com/elastic/beats <= 7.6.2`

## Remediation

Upgrade to a patched release:

- `github.com/elastic/beats/v7 8.19.9`
- `github.com/elastic/beats/v7 9.1.9`
- `github.com/elastic/beats/v7 9.2.3`
- `github.com/elastic/beats/v7 7.0.0-alpha2.0.20251204214633-dd3af18220bf`