CVE-2026-21729

{"id": "CVE-2026-21729", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-21729", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-16T12:45:38.984777Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security@grafana.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security@grafana.com", "affectedData": [{"vendor": "Grafana", "product": "Loki", "versions": [{"status": "affected", "version": "v3.0.0", "lessThan": "v3.7.0", "versionType": "semver"}], "platforms": ["OnPrem", "Cloud"], "defaultStatus": "unaffected"}]}], "published": "2026-07-16T04:17:29.260", "references": [{"url": "https://grafana.com/security/security-advisories/cve-2026-21729", "source": "security@grafana.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-770"}]}], "descriptions": [{"lang": "en", "value": "Loki queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy."}], "lastModified": "2026-07-16T14:16:49.383", "sourceIdentifier": "security@grafana.com"}