CVE-2026-27878Network attack vector

Authenticated service crash via uncapped exemplars hint

Published Jun 19, 2026 · Updated Jun 19, 2026

Denial of service in Grafana Tempo before 2.10.2 allows remote authenticated users to crash the service via a crafted TraceQL query. The metrics query-range path accepts an exemplars hint above the configured maximum and propagates it through sharding and result combination, causing excessive exemplar allocation. Reachability requires authenticated query access to Tempo or Grafana Enterprise Traces, and the bounded impact is an out-of-memory process crash.

CVSS severity6.5
Medium
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Grafana Tempo before 2.10.2 allows remote authenticated users to crash the service via a crafted TraceQL query. The metrics query-range path accepts an exemplars hint above the configured maximum and propagates it through sharding and result combination, causing excessive exemplar allocation. Reachability requires authenticated query access to Tempo or Grafana Enterprise Traces, and the bounded impact is an out-of-memory process crash.

The record

CVE
CVE-2026-27878
Published
Jun 19, 2026
Updated
Jun 19, 2026
Vendor
Grafana Labs
Product
Grafana Tempo
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.0 <2.10.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Grafana Labs · Grafana Tempoversion=2.6.0 <2.10.2
Grafana Labs · Grafana Enterprise Tracesversion=2.6.1 <2.8.8

Published CVSS scores

6.5Grafana LabsCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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