What is CVE-2026-33374?

CVE-2026-33374 is a security advisory published by Grafana Labs Security. Unbounded memory allocation in the Prometheus rule conversion API

Why does CVE-2026-33374 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-2026-33374?

CVE-2026-33374 affects 1 product, including: Grafana.

CVE-2026-33374Disclosed before NVD

Unbounded memory allocation in the Prometheus rule conversion API

Vendor

Grafana Labs Security

Published

October 13, 2026

Last Modified

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📋 Description

The Prometheus rule conversion API endpoints in Grafana do not limit request body size, allowing authenticated users to trigger unbounded memory allocations that can crash the server through out-of-memory conditions.

🎯 Affected products1

Grafana

🔗 References (1)

advisoryhttps://grafana.com/security/security-advisories/cve-2026-33374/