CVE-2026-21729
Loki detected_fields query limits results in unbounded memory allocation
Description
Loki queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy.
INFO
Published Date :
July 16, 2026, 4:17 a.m.
Last Modified :
July 16, 2026, 2:16 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 | HIGH | [email protected] |
Solution
- Configure query limits to prevent large memory allocations.
- Monitor Loki for resource utilization.
- Adjust deployment strategy if needed.
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-2026-21729.
| URL | Resource |
|---|---|
| https://grafana.com/security/security-advisories/cve-2026-21729 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-21729 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-2026-21729
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-2026-21729 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-21729 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.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 16, 2026
Action Type Old Value New Value Added CWE CWE-770 Added SSVC {'id': 'CVE-2026-21729', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-16T12:45:38.984777Z'} -
New CVE Received by [email protected]
Jul. 16, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Grafana', 'product': 'Loki', 'versions': [{'status': 'affected', 'version': 'v3.0.0', 'lessThan': 'v3.7.0', 'versionType': 'semver'}], 'platforms': ['OnPrem', 'Cloud'], 'defaultStatus': 'unaffected'}] Added Description Loki queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added Reference https://grafana.com/security/security-advisories/cve-2026-21729