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CVE-2026-33374Unbounded memory allocation in the Prometheus rule conversion API

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.

Timeline

  1. ID reserved

    By GRAFANA

  2. · 7 months later

    Published

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-33374, by who scored it
Scored byCVSSScoreVector
GRAFANACNA (assigner)3.1Medium6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Awaiting Analysis3.1Medium6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.37% · top 69% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.

Affected products

  • Grafana · Grafana Enterprise

    • affected 12.0.0 – ≤ 12.3.11
    • affected 12.4.0 – < 12.4.13
    • affected 13.0.0 – < 13.0.11
    • affected 13.1.0 – < 13.1.8
    • affected 13.2.0 – < 13.2.4

  • Grafana · Grafana OSS

    • affected 12.0.0 – ≤ 12.3.11
    • affected 12.4.0 – < 12.4.13
    • affected 13.0.0 – < 13.0.11
    • affected 13.1.0 – < 13.1.8
    • affected 13.2.0 – < 13.2.4

References

References1

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .