CVE-2026-21726

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Source
https://cve.org/CVERecord?id=CVE-2026-21726
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-21726.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-21726
Aliases
Downstream
Related
Published
2026-04-15T19:24:31.268Z
Modified
2026-05-18T05:57:39.014424405Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
Summary
Loki Path Traversal - CVE-2021-36156 Bypass
Details

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.

Database specific 
{
    "cna_assigner": "GRAFANA",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21726.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "2.3.0"
                },
                {
                    "fixed": "3.5.9"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ]
}
References

Affected packages

Git / github.com/grafana/loki

Affected ranges

Type
GIT
Repo
https://github.com/grafana/loki
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
d80526692af3bf28c35622a59a3231933b193bc2
Database specific 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "3.6.4"
        }
    ],
    "source": "CPE_FIELD",
    "cpe": "cpe:2.3:a:grafana:loki:*:*:*:*:*:*:*:*"
}

Affected versions

helm-loki-3.*
helm-loki-3.0.0
helm-loki-3.0.1
helm-loki-3.0.2
helm-loki-3.0.3
helm-loki-3.0.4
helm-loki-3.0.5
helm-loki-3.0.6
helm-loki-3.0.7
helm-loki-3.0.8
helm-loki-3.0.9
helm-loki-3.1.0
helm-loki-3.10.0
helm-loki-3.2.0
helm-loki-3.2.1
helm-loki-3.2.2
helm-loki-3.3.0
helm-loki-3.3.1
helm-loki-3.3.2
helm-loki-3.3.3
helm-loki-3.3.4
helm-loki-3.4.0
helm-loki-3.4.1
helm-loki-3.4.2
helm-loki-3.4.3
helm-loki-3.5.0
helm-loki-3.6.0
helm-loki-3.6.1
helm-loki-3.7.0
helm-loki-3.8.0
helm-loki-3.8.1
helm-loki-3.8.2
helm-loki-3.9.0
helm-loki-4.*
helm-loki-4.0.0
helm-loki-4.1.0
helm-loki-4.10.0
helm-loki-4.2.0
helm-loki-4.3.0
helm-loki-4.4.0
helm-loki-4.4.1
helm-loki-4.4.2
helm-loki-4.5.0
helm-loki-4.5.1
helm-loki-4.6.0
helm-loki-4.6.1
helm-loki-4.6.2
helm-loki-4.7.0
helm-loki-4.8.0
helm-loki-4.9.0
helm-loki-5.*
helm-loki-5.0.0
helm-loki-5.1.0
helm-loki-5.10.0
helm-loki-5.11.0
helm-loki-5.12.0
helm-loki-5.13.0
helm-loki-5.14.0
helm-loki-5.14.1
helm-loki-5.15.0
helm-loki-5.17.0
helm-loki-5.18.0
helm-loki-5.18.1
helm-loki-5.19.0
helm-loki-5.2.0
helm-loki-5.20.0
helm-loki-5.21.0
helm-loki-5.22.0
helm-loki-5.22.1
helm-loki-5.22.2
helm-loki-5.23.0
helm-loki-5.23.1
helm-loki-5.24.0
helm-loki-5.25.0
helm-loki-5.26.0
helm-loki-5.27.0
helm-loki-5.28.0
helm-loki-5.29.0
helm-loki-5.3.0
helm-loki-5.3.1
helm-loki-5.30.0
helm-loki-5.31.0
helm-loki-5.32.0
helm-loki-5.33.0
helm-loki-5.34.0
helm-loki-5.35.0
helm-loki-5.36.0
helm-loki-5.36.1
helm-loki-5.36.2
helm-loki-5.36.3
helm-loki-5.37.0
helm-loki-5.38.0
helm-loki-5.39.0
helm-loki-5.4.0
helm-loki-5.40.1
helm-loki-5.41.0
helm-loki-5.41.1
helm-loki-5.41.2
helm-loki-5.41.3
helm-loki-5.41.4
helm-loki-5.41.5
helm-loki-5.41.6
helm-loki-5.41.7
helm-loki-5.41.8
helm-loki-5.42.0
helm-loki-5.42.1
helm-loki-5.42.2
helm-loki-5.42.3
helm-loki-5.43.0
helm-loki-5.43.1
helm-loki-5.43.2
helm-loki-5.43.3
helm-loki-5.43.4
helm-loki-5.43.5
helm-loki-5.43.6
helm-loki-5.43.7
helm-loki-5.44.0
helm-loki-5.44.1
helm-loki-5.44.2
helm-loki-5.44.3
helm-loki-5.44.4
helm-loki-5.45.0
helm-loki-5.46.0
helm-loki-5.47.0
helm-loki-5.47.1
helm-loki-5.47.2
helm-loki-5.5.0
helm-loki-5.5.1
helm-loki-5.5.10
helm-loki-5.5.11
helm-loki-5.5.12
helm-loki-5.5.2
helm-loki-5.5.3
helm-loki-5.5.4
helm-loki-5.5.5
helm-loki-5.5.6
helm-loki-5.5.7
helm-loki-5.5.8
helm-loki-5.5.9
helm-loki-5.6.0
helm-loki-5.6.1
helm-loki-5.6.2
helm-loki-5.6.3
helm-loki-5.6.4
helm-loki-5.7.1
helm-loki-5.8.0
helm-loki-5.8.1
helm-loki-5.8.10
helm-loki-5.8.11
helm-loki-5.8.2
helm-loki-5.8.3
helm-loki-5.8.4
helm-loki-5.8.5
helm-loki-5.8.6
helm-loki-5.8.7
helm-loki-5.8.8
helm-loki-5.8.9
helm-loki-5.9.0
helm-loki-5.9.1
helm-loki-5.9.2
helm-loki-6.*
helm-loki-6.0.0
helm-loki-6.1.0
helm-loki-6.10.0
helm-loki-6.10.1
helm-loki-6.10.2
helm-loki-6.11.0
helm-loki-6.12.0
helm-loki-6.16.0
helm-loki-6.18.0
helm-loki-6.19.0
helm-loki-6.2.0
helm-loki-6.2.1
helm-loki-6.2.2
helm-loki-6.2.3
helm-loki-6.2.4
helm-loki-6.2.5
helm-loki-6.20.0
helm-loki-6.21.0
helm-loki-6.22.0
helm-loki-6.23.0
helm-loki-6.24.0
helm-loki-6.24.1
helm-loki-6.25.0
helm-loki-6.25.1
helm-loki-6.26.0
helm-loki-6.27.0
helm-loki-6.28.0
helm-loki-6.29.0
helm-loki-6.3.0
helm-loki-6.3.1
helm-loki-6.3.2
helm-loki-6.3.3
helm-loki-6.3.4
helm-loki-6.30.1
helm-loki-6.31.0
helm-loki-6.32.0
helm-loki-6.33.0
helm-loki-6.34.0
helm-loki-6.35.0
helm-loki-6.35.1
helm-loki-6.36.0
helm-loki-6.36.1
helm-loki-6.37.0
helm-loki-6.38.0
helm-loki-6.39.0
helm-loki-6.4.0
helm-loki-6.4.1
helm-loki-6.4.2
helm-loki-6.40.0
helm-loki-6.41.0
helm-loki-6.41.1
helm-loki-6.42.0
helm-loki-6.43.0
helm-loki-6.5.0
helm-loki-6.5.1
helm-loki-6.5.2
helm-loki-6.6.0
helm-loki-6.6.1
helm-loki-6.6.2
helm-loki-6.6.3
helm-loki-6.6.4
helm-loki-6.6.5
helm-loki-6.6.6
helm-loki-6.7.0
helm-loki-6.7.1
helm-loki-6.7.2
helm-loki-6.7.3
helm-loki-6.7.4
helm-loki-6.8.0
helm-loki-6.9.0
operator/v0.*
operator/v0.4.0
operator/v0.5.0
operator/v0.6.0
operator/v0.6.1
operator/v0.6.2
operator/v0.7.0
operator/v0.7.1
operator/v0.8.0
pkg/logql/syntax/v0.*
pkg/logql/syntax/v0.0.1
v0.*
v0.1.0
v0.2.0
v0.3.0
v0.4.0
v1.*
v1.0.0
v1.0.1
v1.1.0
v1.2.0
v1.3.0
v1.5.0
v1.6.0
v2.*
v2.0.0
v3.*
v3.6.0
v3.6.1
v3.6.2
v3.6.3

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-21726.json"