Vulnerability · Published Mar 19, 2026 · Assigned by elastic
CVE-2026-26933Improper Validation of Array Index in Packetbeat Leading to Denial of Service
Medium 5.7
In plain English
A medium-severity security flaw in Packetbeat from Elastic. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/elastic/beats | no fix listed | GO-2026-4789 |
| Go | github.com/elastic/beats/v7 | 7.0.0-alpha2.0.20260126223743-dec1b31111ec | GHSA-27qj-9gvp-8rh9 |
| Go | github.com/elastic/beats/v7 | 7.0.0-alpha2.0.20260126223743-dec1b31111ec | GO-2026-4789 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Elastic | Packetbeat | 9.0.0 – through 9.2.48.0.0 – through 8.19.10 |
Weakness: CWE-129 · Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H