Tempo TraceQL query with exemplar hint could result in unbounded memory usage_CVE-2026-27878

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-06-19T19:02:27.028Z",
    "modified": "2026-06-19T19:03:33.602Z",
    "type": "cve",
    "title": "Tempo TraceQL query with exemplar hint could result in unbounded memory usage",
    "source": "GRAFANA",
    "references": "https://grafana.com/security/security-advisories/cve-2026-27878",
    "id": "CVE-2026-27878",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Grafana Enterprise Traces (GET) 2.6.1\nGrafana Tempo 2.6.0",
    "sourceHref": "",
    "cvss": {
        "score": 6.5,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
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            "privilegesRequired": "",
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            "confidentialityImpact": "",
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            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Enterprise Traces (GET)",
    "version": "2.6.1",
    "vendor": "Grafana",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}