Elastic Packetbeat up to 8.19.10/9.2.4 Protocol Parser array index

Summaryinfo

A vulnerability classified as problematic was found in Elastic Packetbeat up to 8.19.10/9.2.4. Affected by this vulnerability is an unknown functionality of the component Protocol Parser. Executing a manipulation can lead to array index. This vulnerability is handled as CVE-2026-26933. The attack can only be done within the local network. There is not any exploit available.

Detailsinfo

A vulnerability was found in Elastic Packetbeat up to 8.19.10/9.2.4. It has been declared as problematic. This vulnerability affects an unknown function of the component Protocol Parser. The manipulation with an unknown input leads to a array index vulnerability. The CWE definition for the vulnerability is CWE-129. The product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is shared for download at discuss.elastic.co. This vulnerability was named CVE-2026-26933 since 02/16/2026. The exploitation appears to be easy. The attack needs to approached within the local network. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 03/24/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-13142). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• Elastic

Name

• Packetbeat

Version

• 8.19.0
• 8.19.1
• 8.19.2
• 8.19.3
• 8.19.4
• 8.19.5
• 8.19.6
• 8.19.7
• 8.19.8
• 8.19.9
• 8.19.10
• 9.2.0
• 9.2.1
• 9.2.2
• 9.2.3
• 9.2.4

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CPE 2.2info

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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