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Vulnerability record · CVE-2026-26933 · published 19 March 2026

CVE-2026-26933: Elasticsearch packetbeat vulnerability

Elasticsearch · Packetbeat

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.

5.7 CVSS 3.1 Medium EPSS 0.29% · top 80.5% CWE-129 · CWE-129
5.7CVSS 3.1 base score
0.29%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2026-26932Elasticsearch packetbeat vulnerabilityImproper Validation of Array Index (CWE-129) in the PostgreSQL protocol parser in Packetbeat can lead Denial of Service via Input Data Manipulation (…EPSS 0.71%7.5CVE-2017-11480Elasticsearch packetbeat improper resource shutdown vulnerabilityPacketbeat versions prior to 5.6.4 are affected by a denial of service flaw in the PostgreSQL protocol handler. If Packetbeat is listening for Postgr…EPSS 1.4%6.5CVE-2025-68381Elasticsearch packetbeat out-of-bounds write vulnerabilityImproper Bounds Check (CWE-787) in Packetbeat can allow a remote unauthenticated attacker to exploit a Buffer Overflow (CAPEC-100) and reliably crash…EPSS 0.46%6.5CVE-2025-68382Elasticsearch packetbeat out-of-bounds read vulnerabilityOut-of-bounds read (CWE-125) allows an unauthenticated remote attacker to perform a buffer overflow (CAPEC-100) via the NFS protocol dissector, leadi…EPSS 0.25%5.3CVE-2025-68388Elasticsearch packetbeat allocation without limits vulnerabilityAllocation of resources without limits or throttling (CWE-770) allows an unauthenticated remote attacker to cause excessive allocation (CAPEC-130) of…EPSS 0.41%8.8CVE-2022-48503Apple WebKit bounds check flaw allows code execution via web contentApple fixed an insufficient bounds-checking issue in WebKit across Safari, iOS, iPadOS, macOS, tvOS and watchOS. Processing malicious web content can…KEVEPSS 3.2%analysed

Source: NIST National Vulnerability Database (record CVE-2026-26933), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.