How severe is CVE-2026-21728?

CVE-2026-21728 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-21728 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21728?

CVE-2026-21728 affects Grafana Tempo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21728?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-21728 have an EU (EUVD) identifier?

Yes. CVE-2026-21728 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25408.

When was CVE-2026-21728 published?

CVE-2026-21728 was published on 2026-04-24 and last updated on 2026-06-30.

CVE-2026-21728

CVE-2026-21728 is a high-severity vulnerability in Grafana Tempo with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25408
Weakness: CWE-400
Affected product: Grafana Tempo
Published: 2026-04-24
Last modified: 2026-06-30

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).

Frequently asked questions

What is 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. Mitigation can be done by setting max_result_limit in the search config, e.g. to 262144 (2^18).
How severe is CVE-2026-21728?: CVE-2026-21728 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-21728 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21728?: CVE-2026-21728 affects Grafana Tempo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21728?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-21728 have an EU (EUVD) identifier?: Yes. CVE-2026-21728 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25408.
When was CVE-2026-21728 published?: CVE-2026-21728 was published on 2026-04-24 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:grafana:tempo:*:*:*:*:*:*:*:*

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