Elasticsearch: Mehrere Schwachstellen ermöglichen Denial of Service
WID-SEC-2026-3573 · first 25.09.2026 · updated 28.09.2026 · CVSS 6,5
What it is about
Elasticsearch ist eine Open Source, verteilte Echtzeit-Suche und Analyse-Engine. Ein Angreifer kann mehrere Schwachstellen in Elasticsearch ausnutzen, 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
- einen Denial of Service Angriff durchzuführen
Am I affected?
Affected according to the BSI:
- Open Source Elasticsearch <8.19.22
- Open Source Elasticsearch <9.4.7
- Open Source Elasticsearch <9.5.4
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 8.19.22
- Open Source Elasticsearch 9.4.7
- Open Source Elasticsearch 9.5.4
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
- Original BSI advisory (WID)
- Elastic Security Announcement vom 2026-09-24 discuss.elastic.co
- Elastic Security Announcement vom 2026-09-24 discuss.elastic.co
- Elastic Security Announcement vom 2026-09-24 discuss.elastic.co
- Elastic Security Announcement vom 2026-09-24 discuss.elastic.co
- Elastic Security Announcement vom 2026-09-24 discuss.elastic.co
- Elastic Security Announcement vom 2026-09-24 discuss.elastic.co
- Elastic Security Announcement vom 2026-09-24 discuss.elastic.co
CVE: CVE-2026-82294, CVE-2026-82300, CVE-2026-94396, CVE-2026-94397, CVE-2026-94398, CVE-2026-94399, CVE-2026-94408
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.