{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:grafana:tempo:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "2.6.0"
              },
              {
                "fixed": "2.8.4"
              },
              {
                "introduced": "2.9.0"
              },
              {
                "fixed": "2.9.2"
              },
              {
                "introduced": "2.10.0"
              },
              {
                "fixed": "2.10.2"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "e85bbc57de52cc9044bc0911de0d1afe5d1fbe07"
            },
            {
              "fixed": "8ce8017366bc1106b75c20864f200ad84f649515"
            },
            {
              "introduced": "607c7fb69662262bbb4462da1e2d91067dab6785"
            },
            {
              "fixed": "f9ce27b87f3f95d1d4533cef143e360be0c4a829"
            },
            {
              "introduced": "5773eb8b0bdd4439a6c065e54f777e4f77d419a1"
            },
            {
              "fixed": "9ce71d29b791b6a3ee7397038a85d8afc3a250fd"
            }
          ],
          "repo": "https://github.com/grafana/tempo",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "GRAFANA",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27878.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "2.6.1"
          },
          {
            "fixed": "2.8.8"
          },
          {
            "introduced": "2.6.0"
          },
          {
            "fixed": "2.10.2"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "A TraceQL query in Grafana Tempo with a large exemplars hint value can cause the Tempo instance to allocate an excessive amount of memory, resulting in an out-of-memory crash. This could allow an authenticated user to trigger a denial of service against the Tempo service.",
  "id": "CVE-2026-27878",
  "modified": "2026-07-11T03:53:39.368375496Z",
  "published": "2026-06-19T19:02:27.028Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27878.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://grafana.com/security/security-advisories/cve-2026-27878"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27878"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Tempo TraceQL query with exemplar hint could result in unbounded memory usage"
}