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Elasticsearch: Mehrere Schwachstellen ermöglichen DoS und die Offenlegung von Informationen

WID-SEC-2026-2457 · first 22.07.2026 · updated 22.07.2026 · CVSS 6,5

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What it is about

Elasticsearch ist eine Open Source, verteilte Echtzeit-Suche und Analyse-Engine. Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Elasticsearch ausnutzen, um einen Denial of Service Angriff durchzuführen und vertrauliche Informationen offenzulegen.

Under what conditions?

Over the network, but only with valid access (login required), for example with stolen credentials or as an insider.

What can happen in the worst case

An attacker could use the vulnerability to

  • einen Denial of Service Angriff durchzuführen
  • vertrauliche Informationen offenzulegen

Am I affected?

Affected according to the BSI:

  • Open Source Elasticsearch <8.19.19
  • Open Source Elasticsearch <9.3.8
  • Open Source Elasticsearch <9.4.4

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 8.19.19
  • Open Source Elasticsearch 9.3.8
  • Open Source Elasticsearch 9.4.4

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-2026-56144, CVE-2026-56145, CVE-2026-63136, CVE-2026-63140, CVE-2026-63144, CVE-2026-63263

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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