{"id":"CVE-2026-21728","aliases":["GHSA-p4r4-xvrq-gvmc","GO-2026-5528"],"url":"https://o3.security/vulnerability/CVE-2026-21728","summary":"Tempo query limit results in unbounded memory allocation","details":"Tempo queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy.\n\nMitigation can be done by setting max_result_limit in the search config, e.g. to 262144 (2^18). Alternatively, automatically restart the service.","published":"2026-04-24T08:00:47.074Z","modified":"2026-08-05T03:30:16.189087809Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.00637,"percentile":0.47158,"asOf":"2026-08-08"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/grafana/tempo","fixedVersion":"2.8.4"},{"ecosystem":"Go","name":"github.com/grafana/tempo","fixedVersion":"2.9.2"},{"ecosystem":"Go","name":"github.com/grafana/tempo","fixedVersion":"2.10.2"}],"fix":null,"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21728.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:21769"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:22347"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:22423"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:23345"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24503"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-21728"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21728.json"},{"type":"ADVISORY","url":"https://grafana.com/security/security-advisories/cve-2026-21728"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21728"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2461395"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-05T03:30:16.189087809Z"}}