TI-2026-21420 Aliases CVE-2026-26933 GHSA-27qj-9gvp-8rh9

Improper Validation of Array Index in Packetbeat Leading to Denial of Service

LOW 25CWE-129Published 2026-03-19 · Updated 2026-03-19

Key facts

Attack vector: Adjacent network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-129 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00238 14th percentileScored 2026-11-07

Fix Fixed github.com/elastic/beats/v7 (Go): 7.0.0-alpha2.0.20260126223743-dec1b31111ec

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Elastic	Packetbeat	9.0.0 – 9.2.4; 8.0.0 – 8.19.10	—	No fix listed	CNA
—	github.com/elastic/beats/v7 (Go)	before 7.0.0-alpha2.0.20260126223743-dec1b31111ec	7.0.0-alpha2.0.20260126223743-dec1b31111ec	Patch available	GHSA-27qj-9gvp-8rh9

Packetbeat VendorElastic Affected 9.0.0 – 9.2.4; 8.0.0 – 8.19.10 Fixed in — No fix listed CNA
github.com/elastic/beats/v7 (Go) Vendor— Affected before 7.0.0-alpha2.0.20260126223743-dec1b31111ec Fixed in 7.0.0-alpha2.0.20260126223743-dec1b31111ec Patch available GHSA-27qj-9gvp-8rh9

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:elasticsearch:packetbeat::::::::	8.0.0 to before 8.19.11; 9.0.0 to before 9.2.5	Vulnerable	Elasticsearch

cpe:2.3:a:elasticsearch:packetbeat:*:*:*:*:*:*:*:* Versions 8.0.0 to before 8.19.11; 9.0.0 to before 9.2.5 Vulnerable ·Elasticsearch

Remediation

Fix · GHSA-27qj-9gvp-8rh9 github.com/elastic/beats/v7 (Go) Fixed in 7.0.0-alpha2.0.20260126223743-dec1b31111ec Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-26933
2026-10-03 Alias added: GHSA-27qj-9gvp-8rh9

References

Advisory 2

Other 3

TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
TI-2015-01295 The Groovy scripting engine in Elasticsearch before 1.3.8 and 1.4.x before 1.4.3 allows… KEVCVSS 3.1CRITICAL 9.8
TI-2014-02491 The default configuration in Elasticsearch before 1.2 enables dynamic scripting, which… KEVCVSS 3.1HIGH 8.1
TI-2018-12328 Kibana versions before 6.4.3 and 5.6.13 contain an arbitrary file inclusion flaw in the… CVSS 3.0CRITICAL 9.8
TI-2023-15037 Elasticsearch StackOverflow vulnerability CVSS 3.1HIGH 7.5
TI-2021-05135 Information disclosure in Elasticsearch CVSS 3.1MEDIUM 6.5

See all 414 →

Sources

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