VulnerabilityModified
CVE-2026-21728
Tempo queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy.
HIGH 7.5EPSS 0.64%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.64%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.64% probability · 49th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-400, CWE-770
- Affected
- grafana/tempo
- Source
- security@grafana.com
References
- https://grafana.com/security/security-advisories/cve-2026-21728Broken Link
- https://access.redhat.com/errata/RHSA-2026:21769
- https://access.redhat.com/errata/RHSA-2026:22347
- https://access.redhat.com/errata/RHSA-2026:22423
- https://access.redhat.com/errata/RHSA-2026:23345
- https://access.redhat.com/errata/RHSA-2026:24503
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.