What is CVE-2026-88858?

CVE-2026-88858 is a security advisory published by Grafana Labs Security. Server-side expression parser denial of service

Why does CVE-2026-88858 have no CVE ID yet?

Grafana Labs Security published this advisory directly to customers before NVD assigned a CVE ID. This is the embargo-window disclosure pattern — vendors notify customers on day 0; NVD's public record follows days to weeks later.

Which products are affected by CVE-2026-88858?

CVE-2026-88858 affects 1 product, including: Grafana.

CVE-2026-88858Disclosed before NVD

Server-side expression parser denial of service

Vendor

Grafana Labs Security

Published

October 27, 2026

Last Modified

—

📋 Description

A user with the Viewer role in Grafana can crash the server by submitting a crafted server-side math expression (uncontrolled recursion). A user with permission to provision alert rules can make the outage persist across restarts. Thanks to Mukul Goyal for reporting this vulnerability to us.

🎯 Affected products1

Grafana

🔗 References (1)

advisoryhttps://grafana.com/security/security-advisories/cve-2026-88858/