{"id":"CVE-2026-21728","title":"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","summary":"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 …","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-400","CWE-770"],"vendor":"grafana","product":"tempo","affected":["tempo >= 1.3.0, < 2.8.4","tempo >= 2.9.0, < 2.9.2","tempo >= 2.10.0, < 2.10.2"],"patched":["tempo 2.10.2"],"published":"2026-04-24","updated":"2026-09-09","sourceUpdated":"2026-09-09T13:18:44.397","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-21728","references":[{"url":"https://grafana.com/security/security-advisories/cve-2026-21728","label":"security@grafana.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:21769","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:22347","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:22423","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:23345","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:24503","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-21728","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2461395","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21728.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-21728"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21728"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-04-24T11:29:58.649315Z"},"epss":0.00637,"epssPercentile":0.48796,"ingestedAt":"2026-06-29T21:48:47.443Z","slug":"CVE-2026-21728","body":"## Overview\n\nTempo 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.\n\n## Affected\n\n- `tempo >= 1.3.0, < 2.8.4`\n- `tempo >= 2.9.0, < 2.9.2`\n- `tempo >= 2.10.0, < 2.10.2`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `tempo 2.10.2`\n\n## Vendor advisories\n\n- **RHSA-2026:22423** · Red Hat · fixed in: Multicluster Global Hub 1.3.4 · released 2026-06-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:22423)\n- **RHSA-2026:22347** · Red Hat · fixed in: Multicluster Global Hub 1.4.5 · released 2026-06-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:22347)\n- **RHSA-2026:23345** · Red Hat · fixed in: Multicluster Global Hub 1.6.5 · released 2026-06-04 · [advisory](https://access.redhat.com/errata/RHSA-2026:23345)\n- **RHSA-2026:24503** · Red Hat · fixed in: Multicluster Global Hub 1.7.0 · released 2026-06-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:24503)\n- **RHSA-2026:21769** · Red Hat · fixed in: Red Hat multicluster global hub 1.5.3 · released 2026-05-28 · [advisory](https://access.redhat.com/errata/RHSA-2026:21769)\n- **Red Hat VEX** · Important · affected: Red Hat Ceph Storage 5, Red Hat Ceph Storage 6, Red Hat Ceph Storage 9, Red Hat OpenShift distributed tracing 3 · no fix planned: Red Hat Ceph Storage 5, Red Hat Ceph Storage 6, Red Hat Ceph Storage 9, Red Hat OpenShift distributed tracing 3 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21728.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}