CVE-2026-26933: Packetbeat does not properly validate an array index in multiple protocol parser components

CVE-2026-26933 · Severity: low · CVSS 3.1 · Published 2026-04-07

Packetbeat does not properly validate an array index in multiple protocol parser components in github.com/elastic/beats

Technologies: github.com/elastic/beats (Go), github.com/elastic/beats/v7 (Go). Vendors: Go.

Quick answers

Is CVE-2026-26933 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-26933 being exploited in the wild.
How severe is CVE-2026-26933?
Low severity, with a CVSS score of 3.1, published 7 April 2026.
Which products and versions are affected?
github.com/elastic/beats (Go) SEMVER:introduced=0; github.com/elastic/beats/v7 (Go) SEMVER:introduced=0,fixed=7.0.0-alpha2.0.20260126223743-dec1b31111ec.
Is there a fix for CVE-2026-26933?
Yes. github.com/elastic/beats/v7 (Go): upgrade to 7.0.0-alpha2.0.20260126223743-dec1b31111ec or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-26933?
Check whether you run github.com/elastic/beats (Go) or github.com/elastic/beats/v7 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/elastic/beats/v7 (Go): upgrade to 7.0.0-alpha2.0.20260126223743-dec1b31111ec or later
    go get github.com/elastic/beats/v7@v7.0.0-alpha2.0.20260126223743-dec1b31111ec

Affected products

  • github.com/elastic/beats (Go) SEMVER:introduced=0
  • github.com/elastic/beats/v7 (Go) SEMVER:introduced=0,fixed=7.0.0-alpha2.0.20260126223743-dec1b31111ec

Identifiers

  • CVE-2026-26933
  • GHSA-27qj-9gvp-8rh9
  • GO-2026-4789

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