CVE-2026-26933 MEDIUM

CVE-2026-26933: Improper Validation of Array Index in Packetbeat Leading to Denial of Service

Vendor Elastic
Product Packetbeat
Weakness CWE-129
Published March 19, 2026
Last update March 19, 2026

CVSS base score

5.7/10
Attack vector Adjacent
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 19, 2026 CVE published
March 19, 2026 Record updated