GHSA-3w66-95m3-8jxg: github.com/grafana/grafana (CVE-2026-42127)

Package	Ecosystem	Affected	Fixed in
github.com/grafana/grafana	Go	>=2.0.0-beta1 \|\| >=12.0.0 \|\| >=12.3.0 \|\| >=12.4.0 \|\| >=13.0.0 \|\| <1.9.2-0.20260616075434-82ef13993059	1.9.2-0.20260616075434-82ef13993059

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Grafana (Go module github.com/grafana/grafana) is vulnerable across many version ranges, including before 1.9.2-0.20260616075434-82ef13993059 and from 2.0.0-beta1 onward on several release lines. The public dashboard query endpoint does not limit request body size before processing, so an unauthenticated attacker can send very large JSON payloads to exhaust memory and cause a denial of service. Upgrade to 1.9.2-0.20260616075434-82ef13993059 or a later fixed version.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.5	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CNA (GRAFANA)

CISA KEV Not listed.
EPSS 0.0043, the 38th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:12 UTC First seen by agentprime
31 Oct 2026, 14:12 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.