{"id":"CVE-2026-27878","summary":"Tempo TraceQL query with exemplar hint could result in unbounded memory usage","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.","modified":"2026-07-11T03:53:39.368375496Z","published":"2026-06-19T19:02:27.028Z","database_specific":{"unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"2.6.1"},{"fixed":"2.8.8"},{"introduced":"2.6.0"},{"fixed":"2.10.2"}]}],"cna_assigner":"GRAFANA","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27878.json"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/grafana/tempo","events":[{"introduced":"e85bbc57de52cc9044bc0911de0d1afe5d1fbe07"},{"fixed":"8ce8017366bc1106b75c20864f200ad84f649515"},{"introduced":"607c7fb69662262bbb4462da1e2d91067dab6785"},{"fixed":"f9ce27b87f3f95d1d4533cef143e360be0c4a829"},{"introduced":"5773eb8b0bdd4439a6c065e54f777e4f77d419a1"},{"fixed":"9ce71d29b791b6a3ee7397038a85d8afc3a250fd"}],"database_specific":{"source":"CPE_RANGE","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"}]}}],"versions":["v2.10.1","v2.10.0","v2.9.1","v2.9.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27878.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}