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

Description (CNA)

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 (CNA)

Vendor / product	Versions
Elastic / Packetbeat	affected 9.0.0 through 9.2.4; affected 8.0.0 through 8.19.10

CWE

CWE-129

References

https://discuss.elastic.co/t/packetbeat-8-19-11-9-2-5-security-update-esa-2026-11/385533

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.