Quick answers
- Is CVE-2026-88858 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-88858 being exploited in the wild.
- How severe is CVE-2026-88858?
- Medium severity, with a CVSS score of 6.5, published 28 October 2026.
- Which products and versions are affected?
- Grafana Grafana.
- Is there a fix for CVE-2026-88858?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-88858 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-88858?
- Check whether you run Grafana. 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.
Technical details
A user with the Viewer role can submit a crafted server-side math expression that triggers uncontrolled recursion, causing the Grafana server to crash (denial of service). A user with alert provisioning permissions can embed such an expression in an alert rule to make the outage persist across service restarts. The vulnerability requires only user interaction through the web interface with minimal permissions.
Affected products
- Grafana Grafana
Timeline
- 2026-10-28: disclosed