{"id":"GHSA-497x-rrr9-68jp","revision":null,"records":[{"revision":"e098dbe6b60f459bb67040bf86b3a3fe","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-21726","aliases":[],"title":"Loki Path Traversal - CVE-2021-36156 Bypass","description":"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}\n\nThanks to Prasanth Sundararajan for reporting this vulnerability.","state":0,"publishedAt":"2026-04-15T19:24:31.268+00:00","modifiedAt":"2026-08-27T17:22:30.899+00:00","affected":[{"ecosystem":"Vendor product","name":"Loki","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Grafana\",\n                    \"product\": \"Loki\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"2.3.0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"3.5.9\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3,"severity":"MEDIUM"}],"references":["https://grafana.com/security/security-advisories/cve-2026-21726"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-21726","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-21726","identifiers":["CVE-2026-21726"]},"retained":false,"historicalAffected":[]},{"revision":"e8615744ca1c4013bfac4b7b2252be63","observedAt":"2026-11-01T03:06:29.223+00:00","statement":{"source":"euvd","id":"EUVD-2026-23100","aliases":["CVE-2026-21726"],"title":"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}","description":"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}\n\nThanks to Prasanth Sundararajan for reporting this vulnerability.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3,"severity":null}],"references":["https://grafana.com/security/security-advisories/cve-2026-21726"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-23100","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Apr 15, 2026, 7:24:31 PM","dateUpdated":"Aug 27, 2026, 5:22:30 PM"},"relatedAdvisories":[{"id":"WID-SEC-W-2026-0242","title":"Grafana Loki: Schwachstelle ermöglicht Offenlegung von Informationen","vulnerabilityIds":["CVE-2026-21726"]}],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-23100","identifiers":["EUVD-2026-23100","CVE-2026-21726"]},"retained":false,"historicalAffected":[]},{"revision":"43a93c69002448c9ba363fff3b5616d2","observedAt":"2026-10-27T06:23:31.154+00:00","statement":{"source":"nvd","id":"CVE-2026-21726","aliases":[],"title":"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}","description":"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}\n\nThanks to Prasanth Sundararajan for reporting this vulnerability.","state":0,"publishedAt":"2026-04-15T20:16:34.177+00:00","modifiedAt":"2026-10-26T21:10:00.17+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security@grafana.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3,"severity":"MEDIUM"}],"references":["https://grafana.com/security/security-advisories/cve-2026-21726"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-21726","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-22"],"productCriteria":["cpe:2.3:a:grafana:loki:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-04-15T20:16:34.177","lastModified":"2026-10-26T21:10:00.170"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-21726","identifiers":["CVE-2026-21726"]},"retained":false,"historicalAffected":[]},{"revision":"7b74232d45db458c9a7b24898d7bc4d2","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-497x-rrr9-68jp","aliases":["CVE-2026-21726","GO-2026-5115"],"title":"Grafana Loki Path Traversal - CVE-2021-36156 Bypass","description":"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}\n\nThanks to Prasanth Sundararajan for reporting this vulnerability.","state":0,"publishedAt":"2026-04-15T21:30:18+00:00","modifiedAt":"2026-09-10T03:51:00.9388901+00:00","affected":[{"ecosystem":"Go","name":"github.com/grafana/loki/v3","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"3.6.4"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://nvd.nist.gov/vuln/detail/CVE-2026-21726","https://github.com/grafana/loki","https://grafana.com/security/security-advisories/cve-2026-21726"],"sourceUrl":"https://github.com/advisories/GHSA-497x-rrr9-68jp","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-497x-rrr9-68jp","identifiers":["GHSA-497x-rrr9-68jp","CVE-2026-21726","GO-2026-5115"]},"retained":false,"historicalAffected":[]},{"revision":"5c7e076f3f4245da9323a3164cdab159","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5115","aliases":["CVE-2026-21726","GHSA-497x-rrr9-68jp"],"title":"Grafana Loki Path Traversal - CVE-2021-36156 Bypass in github.com/grafana/loki","description":"Grafana Loki Path Traversal - CVE-2021-36156 Bypass in github.com/grafana/loki","state":0,"publishedAt":"2026-06-25T18:26:48+00:00","modifiedAt":"2026-07-07T22:59:27.8020625+00:00","affected":[{"ecosystem":"Go","name":"github.com/grafana/loki","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/grafana/loki/v3","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"3.6.4"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/advisories/GHSA-497x-rrr9-68jp","https://nvd.nist.gov/vuln/detail/CVE-2026-21726","https://grafana.com/security/security-advisories/cve-2026-21726"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5115","license":"OSV · upstream source license applies","key":"osv:GO-2026-5115","identifiers":["GO-2026-5115","CVE-2026-21726","GHSA-497x-rrr9-68jp"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-01T17:57:21.4096656+00:00","complete":true,"records":1766,"lastAttemptAt":"2026-11-01T17:57:21.4096656+00:00","lastSuccessAt":"2026-11-01T17:57:21.5916126+00:00","error":null,"lastVerifiedAt":"2026-11-01T17:57:21.5916133+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-aece262bb10a694367a43c24d730aa8e8dc171723eaec4c15cdd32f04bda103f-d5c3ebbfb28a03509d20973fbb2330bc7b9e252e9828be2e66ae9aea69b49ce1","complete":true,"records":417669,"lastAttemptAt":"2026-11-01T18:57:22.5530729+00:00","lastSuccessAt":"2026-11-01T18:57:22.2751752+00:00","error":null,"lastVerifiedAt":"2026-11-01T18:57:22.5530729+00:00","snapshotPublishedAt":"2026-11-01T18:27:50+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-35b3277f93af45a38903f87f33008ff6","complete":false,"records":13568,"lastAttemptAt":"2026-11-01T18:09:13.7653963+00:00","lastSuccessAt":"2026-11-01T18:09:13.759+00:00","error":null,"lastVerifiedAt":"2026-11-01T18:09:13.759+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13449,"expectedIdentifiers":13637,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-01T17:57:21.4096656+00:00","complete":true,"records":1095,"lastAttemptAt":"2026-11-01T17:57:21.4096656+00:00","lastSuccessAt":"2026-11-01T17:57:21.5924164+00:00","error":null,"lastVerifiedAt":"2026-11-01T17:57:21.5924166+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-7045ba394160400f8f8ae145a6052ae9","complete":true,"records":13580,"lastAttemptAt":"2026-11-01T17:57:28.2948021+00:00","lastSuccessAt":"2026-11-01T17:57:28.288+00:00","error":null,"lastVerifiedAt":"2026-11-01T17:57:28.288+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13637,"expectedIdentifiers":13637,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-21dcd6662970dfea02e4ea60ee637115e8d92664947484d2b9276b3f6568a84f","complete":true,"records":9815,"lastAttemptAt":"2026-11-01T17:57:21.3611317+00:00","lastSuccessAt":"2026-10-30T23:47:34.1817587+00:00","error":null,"lastVerifiedAt":"2026-11-01T17:57:21.3611317+00:00","snapshotPublishedAt":"2026-10-30T23:33:17+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-2de9ccc5290f060c7aa63f89c25dd76f655a64ba1aba7c05c97fa3bee4f09899","complete":true,"records":1967,"lastAttemptAt":"2026-11-01T18:57:22.7482139+00:00","lastSuccessAt":"2026-10-28T20:55:34.2982937+00:00","error":null,"lastVerifiedAt":"2026-11-01T18:57:22.7482139+00:00","snapshotPublishedAt":"2026-10-28T20:03:08+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-f95f76cd406ae5bae3de632ad37fd2d5160b44f5e6b51748ac6f8f0c0c88e72b","complete":true,"records":3028,"lastAttemptAt":"2026-11-01T17:57:21.3756349+00:00","lastSuccessAt":"2026-10-30T23:47:38.4914494+00:00","error":null,"lastVerifiedAt":"2026-11-01T17:57:21.3756349+00:00","snapshotPublishedAt":"2026-10-30T23:18:12+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-55acacd40a7aab88cf530cfddf98233a5d800cfc6bb1883653ecf5bee50f4426","complete":true,"records":230996,"lastAttemptAt":"2026-11-01T18:57:28.78235+00:00","lastSuccessAt":"2026-11-01T09:06:49.6961926+00:00","error":null,"lastVerifiedAt":"2026-11-01T17:57:21.1761784+00:00","snapshotPublishedAt":"2026-11-01T08:33:39+00:00","importing":true,"stagedRecords":230997,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}