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6 vulnerabilities found for loki by grafana
CVE-2026-21729 (GCVE-0-2026-21729)
Vulnerability from nvd – Published: 2026-07-16 03:12 – Updated: 2026-08-17 21:28
VLAI
EPSS
VEX
Title
Loki detected_fields query limits results in unbounded memory allocation
Summary
Loki queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-16 12:45 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://grafana.com/security/security-advisories/… | vendor-advisory |
Impacted products
Date Public
2026-02-23 07:50
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CVE-2026-21726 (GCVE-0-2026-21726)
Vulnerability from nvd – Published: 2026-04-15 19:24 – Updated: 2026-08-17 21:28
VLAI
EPSS
VEX
Title
Loki Path Traversal - CVE-2021-36156 Bypass
Summary
The CVE-2021-36156 fix validates the namespace parameter for path traversal sequences after a single URL decode, by double encoding, an attacker can read files at the Ruler API endpoint /loki/api/v1/rules/{namespace}
Thanks to Prasanth Sundararajan for reporting this vulnerability.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-15 20:01 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://grafana.com/security/security-advisories/… | vendor-advisory |
Date Public
2026-04-15 19:20
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CVE-2021-36156 (GCVE-0-2021-36156)
Vulnerability from nvd – Published: 2021-08-03 14:12 – Updated: 2024-08-04 00:47
VLAI
EPSS
VEX
Summary
An issue was discovered in Grafana Loki through 2.2.1. The header value X-Scope-OrgID is used to construct file paths for rules files, and if crafted to conduct directory traversal such as ae ../../sensitive/path/in/deployment pathname, then Loki will attempt to parse a rules file at that location and include some of the contents in the error message.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/grafana/loki/pull/4020#issue-6… | x_refsource_MISC |
| https://github.com/grafana/loki/releases/tag/v2.3.0 | x_refsource_MISC |
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CVE-2026-21729 (GCVE-0-2026-21729)
Vulnerability from cvelistv5 – Published: 2026-07-16 03:12 – Updated: 2026-08-17 21:28
VLAI
EPSS
VEX
Title
Loki detected_fields query limits results in unbounded memory allocation
Summary
Loki queries with large limits can cause large memory allocations which can impact the availability of the service, depending on its deployment strategy.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-16 12:45 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://grafana.com/security/security-advisories/… | vendor-advisory |
Impacted products
Date Public
2026-02-23 07:50
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CVE-2026-21726 (GCVE-0-2026-21726)
Vulnerability from cvelistv5 – Published: 2026-04-15 19:24 – Updated: 2026-08-17 21:28
VLAI
EPSS
VEX
Title
Loki Path Traversal - CVE-2021-36156 Bypass
Summary
The CVE-2021-36156 fix validates the namespace parameter for path traversal sequences after a single URL decode, by double encoding, an attacker can read files at the Ruler API endpoint /loki/api/v1/rules/{namespace}
Thanks to Prasanth Sundararajan for reporting this vulnerability.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-15 20:01 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://grafana.com/security/security-advisories/… | vendor-advisory |
Date Public
2026-04-15 19:20
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CVE-2021-36156 (GCVE-0-2021-36156)
Vulnerability from cvelistv5 – Published: 2021-08-03 14:12 – Updated: 2024-08-04 00:47
VLAI
EPSS
VEX
Summary
An issue was discovered in Grafana Loki through 2.2.1. The header value X-Scope-OrgID is used to construct file paths for rules files, and if crafted to conduct directory traversal such as ae ../../sensitive/path/in/deployment pathname, then Loki will attempt to parse a rules file at that location and include some of the contents in the error message.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/grafana/loki/pull/4020#issue-6… | x_refsource_MISC |
| https://github.com/grafana/loki/releases/tag/v2.3.0 | x_refsource_MISC |
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