CVE-2026-27878
Tempo TraceQL query with exemplar hint could result in unbounded memory usage
Description
A TraceQL query in Grafana Tempo with a large exemplars hint value can cause the Tempo instance to allocate an excessive amount of memory, resulting in an out-of-memory crash. This could allow an authenticated user to trigger a denial of service against the Tempo service.
INFO
Published Date :
June 19, 2026, 7:16 p.m.
Last Modified :
June 29, 2026, 7:59 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Configure Tempo to limit the maximum value for TraceQL exemplar hints.
- Ensure TraceQL queries use reasonable exemplar hint values.
- Monitor Tempo memory usage for potential spikes.
- Update Tempo to the latest stable version.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-27878.
| URL | Resource |
|---|---|
| https://grafana.com/security/security-advisories/cve-2026-27878 | Broken Link |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-27878 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-27878
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-27878 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-27878 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jun. 29, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:grafana:tempo:*:*:*:*:*:*:*:* versions from (including) 2.10.0 up to (excluding) 2.10.2 *cpe:2.3:a:grafana:tempo:*:*:*:*:*:*:*:* versions from (including) 2.9.0 up to (excluding) 2.9.2 *cpe:2.3:a:grafana:tempo:*:*:*:*:*:*:*:* versions from (including) 2.6.0 up to (excluding) 2.8.4 Added Reference Type Grafana Labs: https://grafana.com/security/security-advisories/cve-2026-27878 Types: Broken Link -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 23, 2026
Action Type Old Value New Value Added CWE CWE-400 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 22, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-27878', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-22T17:09:51.414285Z'} -
New CVE Received by [email protected]
Jun. 19, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Grafana', 'product': 'Enterprise Traces (GET)', 'versions': [{'status': 'affected', 'version': '2.6.1', 'lessThan': '2.8.8', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Grafana', 'product': 'Tempo', 'versions': [{'status': 'affected', 'version': '2.6.0', 'lessThan': '2.10.2', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] Added Description A TraceQL query in Grafana Tempo with a large exemplars hint value can cause the Tempo instance to allocate an excessive amount of memory, resulting in an out-of-memory crash. This could allow an authenticated user to trigger a denial of service against the Tempo service. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added Reference https://grafana.com/security/security-advisories/cve-2026-27878