5.7

CVE-2026-26933: elastic packetbeat Improper Validation of Array Index

CVSS: 5.7v3.1MediumAnalyzed
AliasesGHSA-27qj-9gvp-8rh9GO-2026-4789CGA-224w-8wj8-x5v6
Published 19-03-2026Last modified 19-03-2026
Open JSON

Vulnerability summary

CVE-2026-26933 is a medium (CVSS 5.7) Improper Validation of Array Index vulnerability in elastic packetbeat. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 21.8% of scored vulnerabilities.

Overall risk
23/100
0100
Low · default modelHow is this calculated?
CVSS score
5.7/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.31%
0%100%
Low · +0.07 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 2
OPENSUSE-SU-2026:21483-1CGA-F34J-H3HM-M85H

Timeline

  1. 19-03-2026
    PublishedVulnerability first disclosed.
  2. 19-03-2026
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.31%

Chance of exploitation in the next 30 days

Percentile

22%

Versus all other CVEs

30-day change

+0.07 pp

From 0.24% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.31%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard98 products
  • agentbeatAll versions (No fix recorded)
  • agentbeat-fipsAll versions (No fix recorded)
  • apm-server-7.17All versions (No fix recorded)
  • apm-server-8.17All versions (No fix recorded)
  • apm-server-8.18All versions (No fix recorded)
Elastic1 product
  • packetbeat≥ 9.0.0, ≤ 9.2.4 | ≥ 8.0.0, ≤ 8.19.10
Elasticsearch1 product
  • packetbeat≥ 8.0.0, < 8.19.11 | ≥ 9.0.0, < 9.2.5
Github.com/elastic1 product
  • beatsAll versions (No fix recorded)
Github.com/elastic/beats1 product
  • v7< 7.0.0-alpha2.0.20260126223743-dec1b31111ec

5 vendors · 102 products

References

7 links