CVE-2026-21728
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
Tempo queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy.
Mitigation can be done by setting max_result_limit in the search config, e.g. to 262144 (2^18). Alternatively, automatically restart the service.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Grafana | Tempo | 1.3.0 <= 2.8.3 | affected |
| Grafana | Tempo | 2.9.0 <= 2.9.1 | affected |
| Grafana | Tempo | 2.10.0 <= 2.10.1 | affected |
| Grafana | Enterprise Traces (GET) | 1.0.0 <= 2.8.7 | affected |
Weaknesses
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: partial
grafana/tempo: Tempo: Denial of Service via large queries
Additional References
- https://access.redhat.com/security/cve/CVE-2026-21728
- https://bugzilla.redhat.com/show_bug.cgi?id=2461395
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21728.json
- https://access.redhat.com/errata/RHSA-2026:22423
- https://access.redhat.com/errata/RHSA-2026:22347
- https://access.redhat.com/errata/RHSA-2026:23345
- https://access.redhat.com/errata/RHSA-2026:24503
- https://access.redhat.com/errata/RHSA-2026:21769
References
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