Vulnerability-Lookup

GHSA-6XFF-CPCQ-VPW2

Vulnerability from github – Published: 2026-06-19 21:32 – Updated: 2026-08-28 21:50

Summary

Grafana Tempo vulnerable to an out-of-memory crash

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.

Severity

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/grafana/tempo"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.5.1-0.20260303204923-b13f74291d48"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-27878"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-28T21:50:55Z",
    "nvd_published_at": "2026-06-19T19:16:34Z",
    "severity": "MODERATE"
  },
  "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": "GHSA-6xff-cpcq-vpw2",
  "modified": "2026-08-28T21:50:55Z",
  "published": "2026-06-19T21:32:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27878"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grafana/tempo/pull/6559"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grafana/tempo/pull/6646"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grafana/tempo/pull/6792"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grafana/tempo/pull/6802"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grafana/tempo/commit/3d7c78d438890991df594c20ae2031f8934aba3b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grafana/tempo/commit/b13f74291d489672601a10297f8fbcbf7dd19192"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grafana/tempo/commit/b481ae9693f99785691197915066e6306950fa09"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grafana/tempo/commit/e2d51b786aff94de3319c07994c6a5539b121eb5"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/grafana/tempo"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grafana/tempo/releases/tag/v2.10.2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grafana/tempo/releases/tag/v2.8.4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/grafana/tempo/releases/tag/v2.9.2"
    },
    {
      "type": "WEB",
      "url": "https://grafana.com/security/security-advisories/cve-2026-27878"
    }
  ],
  "schema_version": "1.4.0",
  "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": "Grafana Tempo vulnerable to an out-of-memory crash"
}

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

Vulnerability from cvelistv5 – Published: 2026-06-19 19:02 – Updated: 2026-08-27 17:22

Title

Tempo TraceQL query with exemplar hint could result in unbounded memory usage

Summary

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 17:09 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

GRAFANA mitre root

References

1 reference

URL	Tags
https://grafana.com/security/security-advisories/…	vendor-advisory

Impacted products

2 products

Vendor	Product	Version
Grafana	Enterprise Traces (GET)	Affected: 2.6.1 , < 2.8.8 (semver)
Grafana	Tempo	Affected: 2.6.0 , < 2.10.2 (semver)

Date Public

2026-03-23 19:28

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-27878",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-22T17:09:51.414285Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-400",
                "description": "CWE-400 Uncontrolled Resource Consumption",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-23T12:14:04.829Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "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"
          }
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      "providerMetadata": {
        "dateUpdated": "2026-08-27T17:22:34.267Z",
        "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",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
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  },
  "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": "2026-08-27T17:22:34.267Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-6XFF-CPCQ-VPW2

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

Tags

Sightings

Nomenclature