Tempo query limit results in unbounded memory allocation
Priority MEDIUM 40CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 5 fixed, 4 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00637 50th percentileScored 2026-11-07
Fix Partial github.com/grafana/tempo (Go): 2.8.4, 2.9.2, 2.10.2Red Hat: 5 advisoriesRed Hat: 5 fixed, 4 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Grafana | Tempo | 1.3.0 – 2.8.3; 2.9.0 – 2.9.1; 2.10.0 – 2.10.1 | — | No fix listed | CNA |
| Grafana | Enterprise Traces (GET) | 1.0.0 – 2.8.7 | — | No fix listed | CNA |
| — | github.com/grafana/tempo (Go) | 1.3.0 to before 2.8.4 | 2.8.4 | Patch available | GHSA-p4r4-xvrq-gvmc |
| — | github.com/grafana/tempo (Go) | 2.9.0 to before 2.9.2 | 2.9.2 | Patch available | GHSA-p4r4-xvrq-gvmc |
| — | github.com/grafana/tempo (Go) | 2.10.0 to before 2.10.2 | 2.10.2 | Patch available | GHSA-p4r4-xvrq-gvmc |
- Tempo VendorGrafana Affected 1.3.0 – 2.8.3; 2.9.0 – 2.9.1; 2.10.0 – 2.10.1 Fixed in — No fix listed CNA
- Enterprise Traces (GET) VendorGrafana Affected 1.0.0 – 2.8.7 Fixed in — No fix listed CNA
- github.com/grafana/tempo (Go) Vendor— Affected 1.3.0 to before 2.8.4 Fixed in 2.8.4 Patch available GHSA-p4r4-xvrq-gvmc
- github.com/grafana/tempo (Go) Vendor— Affected 2.9.0 to before 2.9.2 Fixed in 2.9.2 Patch available GHSA-p4r4-xvrq-gvmc
- github.com/grafana/tempo (Go) Vendor— Affected 2.10.0 to before 2.10.2 Fixed in 2.10.2 Patch available GHSA-p4r4-xvrq-gvmc
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:grafana:tempo:*:*:*:*:*:*:*:* | 1.3.0 to before 2.8.4; 2.9.0 to before 2.9.2; 2.10.0 to before 2.10.2 | Vulnerable | Grafana |
- cpe:2.3:a:grafana:tempo:*:*:*:*:*:*:*:* Versions 1.3.0 to before 2.8.4; 2.9.0 to before 2.9.2; 2.10.0 to before 2.10.2 Vulnerable ·Grafana
Remediation
- Fix · GHSA-p4r4-xvrq-gvmc github.com/grafana/tempo (Go) Fixed in 2.8.4 Advisory →
- Fix · GHSA-p4r4-xvrq-gvmc github.com/grafana/tempo (Go) Fixed in 2.9.2 Advisory →
- Fix · GHSA-p4r4-xvrq-gvmc github.com/grafana/tempo (Go) Fixed in 2.10.2 Advisory →
Red Hat 5 advisories
- RHSA-2026:24503 Released 2026-06-08 · Red Hat rating ImportantMulticluster Global Hub 1.7.1 security update
- Multicluster Global Hub 1.7.4 registry.redhat.io/multicluster-globalhub/multicluster-globalhub-grafana-rhel9
- RHSA-2026:23345 Released 2026-06-04 · Red Hat rating ImportantMulticluster Global Hub 1.6.2 security update
- Multicluster Global Hub 1.6.6 registry.redhat.io/multicluster-globalhub/multicluster-globalhub-agent-rhel9, registry.redhat.io/multicluster-globalhub/multicluster-globalhub-grafana-rhel9, registry.redhat.io/multicluster-globalhub/multicluster-globalhub-manager-rhel9 +1
- RHSA-2026:22423 Released 2026-06-02 · Red Hat rating ImportantMulticluster Global Hub 1.3.4 security update
- Multicluster Global Hub 1.3.4 registry.redhat.io/multicluster-globalhub/multicluster-globalhub-agent-rhel9, registry.redhat.io/multicluster-globalhub/multicluster-globalhub-grafana-rhel9, registry.redhat.io/multicluster-globalhub/multicluster-globalhub-manager-rhel9 +1
Show 2 more Red Hat advisories
- RHSA-2026:22347 Released 2026-06-01 · Red Hat rating ImportantMulticluster Global Hub 1.4.5 security update
- Multicluster Global Hub 1.4.9 registry.redhat.io/multicluster-globalhub/multicluster-globalhub-agent-rhel9, registry.redhat.io/multicluster-globalhub/multicluster-globalhub-grafana-rhel9, registry.redhat.io/multicluster-globalhub/multicluster-globalhub-manager-rhel9 +1
- RHSA-2026:21769 Released 2026-05-28 · Red Hat rating ImportantMulticluster Global Hub 1.5.4 security update
- Multicluster Global Hub 1.5.8 registry.redhat.io/multicluster-globalhub/multicluster-globalhub-agent-rhel9, registry.redhat.io/multicluster-globalhub/multicluster-globalhub-grafana-rhel9, registry.redhat.io/multicluster-globalhub/multicluster-globalhub-manager-rhel9 +1
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Ceph Storage 5 | Affected | No fix yet |
| Red Hat Ceph Storage 6 | Affected | No fix yet |
| Red Hat Ceph Storage 9 | Affected | No fix yet |
| Red Hat OpenShift distributed tracing 3 | Affected | No fix yet |
| Multicluster Global Hub 1.3.4 | Fixed | RHSA-2026:22423 |
| Multicluster Global Hub 1.4.9 | Fixed | RHSA-2026:22347 |
| Multicluster Global Hub 1.5.8 | Fixed | RHSA-2026:21769 |
| Multicluster Global Hub 1.6.6 | Fixed | RHSA-2026:23345 |
| Multicluster Global Hub 1.7.3 | Fixed | RHSA-2026:24503 |
Not affected: 11 products
- Logging Subsystem for Red Hat OpenShift
- Multicluster Global Hub
- Multicluster Global Hub 1.3.4
- Multicluster Global Hub 1.4.9
- Multicluster Global Hub 1.5.8
- Multicluster Global Hub 1.6.6
- Multicluster Global Hub 1.7.3
- Red Hat Advanced Cluster Management for Kubernetes 2
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 9
- Red Hat OpenShift distributed tracing 3
Timeline
- 2026-10-02 Threatist record created from CVE-2026-21728
- 2026-10-03 Alias added: GHSA-p4r4-xvrq-gvmc
- 2026-10-25 EPSS moved to the 50th–90th percentile
- 2026-10-30 Fix available: Multicluster Global Hub 1.5.8, Multicluster Global Hub 1.6.6 · Red Hat
References
Advisory 2
Other 6
- https://github.com/grafana/tempo/pull/6525
- https://github.com/grafana/tempo/commit/650eb1985a0776789c8564122990f588a742356f
- https://github.com/grafana/tempo
- https://github.com/grafana/tempo/blob/4dc3e5b0d3463a0b67498b662b85a148698b4afd/docs/sources/tempo/release-notes/version-2/v2-10.md?plain=1#L328
- https://github.com/grafana/tempo/blob/4dc3e5b0d3463a0b67498b662b85a148698b4afd/docs/sources/tempo/release-notes/version-2/v2-8.md?plain=1#L251
- https://github.com/grafana/tempo/blob/4dc3e5b0d3463a0b67498b662b85a148698b4afd/docs/sources/tempo/release-notes/version-2/v2-9.md?plain=1#L224
More Grafana Tempo vulnerabilities
- TI-2026-22653 S3 SSE-C Encryption Key Exposed in Plaintext via Config Endpoint (CVE-2025-41118 Pattern) CVSS 3.1HIGH 7.5
- TI-2026-22222 Tempo TraceQL query with exemplar hint could result in unbounded memory usage CVSS 3.1MEDIUM 6.5
Sources
- CVE-2026-21728 · CVE Program
- CVE-2026-21728 · NVD
- FIRST EPSS
- GHSA-p4r4-xvrq-gvmc · GitHub Advisory Database · CC BY 4.0
- CVE-2026-21728 · Red Hat security data · CC BY 4.0
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