CVE-2026-21728
HIGHTempo query limit results in unbounded memory allocation
Title source: cnaDescription
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.
References (9)
Core 9
Core References
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:21769
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:22347
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:22423
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:23345
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:24503
Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-21728
Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2461395
Vendor Advisory vendor-advisory
https://grafana.com/security/security-advisories/cve-2026-21728
Scores
CVSS v3
7.5
EPSS
0.0064
EPSS Percentile
47.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-400
CWE-770
Status
published
Products (7)
Grafana/Enterprise Traces (GET)
1.0.0 - 2.8.7
Grafana/Tempo
1.3.0 - 2.8.3
grafana/tempo
1.3.0 - 2.8.4Go
grafana/tempo
1.3.0 - 2.8.4
Grafana/Tempo
2.10.0 - 2.10.1
Grafana/Tempo
2.9.0 - 2.9.1
Grafana/Tempo
v1.3.0 - v2.11.0
Published
Apr 24, 2026
Tracked Since
Apr 24, 2026