CVE-2026-27878 (GCVE-0-2026-27878)

Vulnerability from cvelistv5 – Published: 2026-06-19 19:02 – Updated: 2026-06-19 19:03
VLAI
Title
Tempo TraceQL query with exemplar hint could result in unbounded memory usage
Summary
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.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Grafana Enterprise Traces (GET) Affected: 2.6.1 , < 2.8.8 (semver)
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Grafana Tempo Affected: 2.6.0 , < 2.10.2 (semver)
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Date Public
2026-03-23 19:28
Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Enterprise Traces (GET)",
          "vendor": "Grafana",
          "versions": [
            {
              "lessThan": "2.8.8",
              "status": "affected",
              "version": "2.6.1",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Tempo",
          "vendor": "Grafana",
          "versions": [
            {
              "lessThan": "2.10.2",
              "status": "affected",
              "version": "2.6.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "datePublic": "2026-03-23T19:28:24.658Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-19T19:03:33.602Z",
        "orgId": "57da9224-a3e2-4646-9d0e-c4dc2e05e7da",
        "shortName": "GRAFANA"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://grafana.com/security/security-advisories/cve-2026-27878"
        }
      ],
      "source": {
        "discovery": "INTERNAL_FINDING"
      },
      "title": "Tempo TraceQL query with exemplar hint could result in unbounded memory usage"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "57da9224-a3e2-4646-9d0e-c4dc2e05e7da",
    "assignerShortName": "GRAFANA",
    "cveId": "CVE-2026-27878",
    "datePublished": "2026-06-19T19:02:27.028Z",
    "dateReserved": "2026-02-24T14:30:17.726Z",
    "dateUpdated": "2026-06-19T19:03:33.602Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.