Unbounded memory allocation in the Prometheus rule conversion API

{
  "id": "a55aba86d0046127d5a690ce77a0c04b88f3f6e9760e29bf2a26958ef4339cd3",
  "url": "https://osv.dev/vulnerability/BIT-grafana-2026-33374",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Unbounded memory allocation in the Prometheus rule conversion API",
    "summary": "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.",
    "evidence": "osv:BIT-grafana-2026-33374",
    "products": [
      {
        "name": {
          "value": "grafana",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "12.4.13",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "13.0.11",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "13.1.8",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "13.2.4",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "BIT-grafana-2026-33374",
      "aliases": [
        "BIT-grafana-2026-33374",
        "CVE-2026-33374"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "12.0.0"
                },
                {
                  "fixed": "12.4.13"
                },
                {
                  "introduced": "13.0.0"
                },
                {
                  "fixed": "13.0.11"
                },
                {
                  "introduced": "13.1.0"
                },
                {
                  "fixed": "13.1.8"
                },
                {
                  "introduced": "13.2.0"
                },
                {
                  "fixed": "13.2.4"
                }
              ]
            }
          ],
          "package": {
            "name": "grafana",
            "purl": "pkg:bitnami/grafana",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V3",
              "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/grafana/BIT-grafana-2026-33374.json"
          }
        }
      ],
      "modified": "2026-10-20T10:30:04.593565659Z",
      "provider": "osv",
      "references": [
        "https://grafana.com/security/security-advisories/cve-2026-33374",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-33374"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:grafana:grafana:*:*:*:*:enterprise:*:*:*",
          "cpe:2.3:a:grafana:grafana:*:*:*:*:*:go:*:*",
          "cpe:2.3:a:grafana:grafana:*:*:*:*:enterprise:go:*:*"
        ],
        "severity": "Medium"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-33374",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 379068,
  "published_at": "2026-10-20T08:44:57.938+00:00"
}