Threat landscape
high

Elasticsearch: Mehrere Schwachstellen

WID-SEC-2026-2841 · first 14.08.2026 · updated 09.10.2026 · CVSS 8,8

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What it is about

Elasticsearch ist eine Open Source, verteilte Echtzeit-Suche und Analyse-Engine. Ein Angreifer kann mehrere Schwachstellen in Elasticsearch ausnutzen, um beliebigen Programmcode auszuführen, und um einen Denial of Service Angriff durchzuführen.

Under what conditions?

The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.

What can happen in the worst case

An attacker could use the vulnerability to

  • beliebigen Programmcode auszuführen
  • einen Denial of Service Angriff durchzuführen

Am I affected?

Affected according to the BSI:

  • Open Source Elasticsearch <8.19.20
  • Open Source Elasticsearch <9.4.5
  • Open Source Elasticsearch <9.5.1

The installed version is usually shown under “Help → About” or in the device’s admin interface.

What helps?

Update to at least:

  • Open Source Elasticsearch 8.19.20
  • Open Source Elasticsearch 9.4.5
  • Open Source Elasticsearch 9.5.1

Is the vulnerability already being exploited?

None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.

Information and sources

CVE: CVE-2026-72636, CVE-2026-72638, CVE-2026-72639, CVE-2026-72642, CVE-2026-72645, CVE-2026-72647, CVE-2026-72656, CVE-2026-72678, CVE-2026-72679, CVE-2026-72683, CVE-2026-72684, CVE-2026-72685, CVE-2026-72686, CVE-2026-72687

Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.

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