{"id":"CVE-2026-27878","aliases":["GHSA-6xff-cpcq-vpw2"],"url":"https://o3.security/vulnerability/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.","published":"2026-06-19T19:02:27.028Z","modified":"2026-08-28T22:10:37.441186932Z","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"},"epss":{"score":0.00411,"percentile":0.34014,"asOf":"2026-08-28"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/grafana/tempo","fixedVersion":"1.5.1-0.20260303204923-b13f74291d48"}],"fix":null,"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-28T22:10:37.441186932Z"}}