Grafana Loki: Schwachstelle ermöglicht Denial of Service
WID-SEC-2026-2391 · first 17.07.2026 · updated 17.07.2026 · CVSS 7,5
What it is about
Grafana Loki ist ein skalierbares, mandantenfähiges Log-Aggregationssystem nach dem Vorbild von Prometheus. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Grafana Loki ausnutzen, um einen Denial of Service Angriff durchzuführen.
Under what conditions?
Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.
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:
- Grafana Loki <3.7.0
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Grafana Loki 3.7.0
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-2026-21729
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.