{"cve":"CVE-2026-27878","nvd":{"published":"2026-06-19T19:16:34.897","modified":"2026-06-29T19:59:27.563","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-400"],"references":["https://grafana.com/security/security-advisories/cve-2026-27878"],"products":["grafana:tempo"],"source":"nvd","synced_at":"2026-10-19T22:39:28.638635428+00:00"},"epss":{"cve":"CVE-2026-27878","score":0.00411,"percentile":0.35359,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-6xff-cpcq-vpw2","url":"https://osv.dev/vulnerability/GHSA-6xff-cpcq-vpw2","summary":"Grafana Tempo vulnerable to an out-of-memory crash","modified":"2026-09-10T03:50:48.631810314Z","packages":[{"ecosystem":"Go","name":"github.com/grafana/tempo","purl":"pkg:golang/github.com/grafana/tempo","ranges":["<1.5.1-0.20260303204923-b13f74291d48"],"fixed":["1.5.1-0.20260303204923-b13f74291d48"]}]},{"id":"GO-2026-6325","url":"https://osv.dev/vulnerability/GO-2026-6325","summary":"Grafana Tempo vulnerable to an out-of-memory crash in github.com/grafana/tempo","modified":"2026-09-06T03:25:56.653359852Z","packages":[{"ecosystem":"Go","name":"github.com/grafana/tempo","purl":"pkg:golang/github.com/grafana/tempo","ranges":["<1.5.1-0.20260303204923-b13f74291d48"],"fixed":["1.5.1-0.20260303204923-b13f74291d48"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}