{"id":"CVE-2026-40923","revision":"73a8cf00040f4325b111448f3d9e2ddb","records":[{"revision":"73a8cf00040f4325b111448f3d9e2ddb","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-40923","aliases":[],"title":"Tekton Pipelines: VolumeMount path restriction bypass via missing filepath.Clean in /tekton/ check","description":"Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. Starting in version 1.0.0 and prior to versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1, a validation bypass in the VolumeMount path restriction allows mounting volumes under restricted /tekton/ internal paths by using .. path traversal components. The restriction check uses strings.HasPrefix without filepath.Clean, so a path like /tekton/home/../results passes validation but resolves to /tekton/results at runtime. Versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 fix the issue.","state":0,"publishedAt":"2026-04-21T20:50:53.742+00:00","modifiedAt":"2026-05-22T15:41:51.388+00:00","affected":[{"ecosystem":"Vendor product","name":"pipeline","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"tektoncd\",\n                    \"product\": \"pipeline\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 1.0.0, < 1.0.2\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 1.2.0, < 1.3.4\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 1.4.0, < 1.6.2\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 1.7.0, < 1.9.3\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 1.10.0, < 1.11.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","score":5.4,"severity":"MEDIUM"}],"references":["https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858","https://github.com/tektoncd/pipeline/releases/tag/v1.11.1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-40923","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-40923","identifiers":["CVE-2026-40923"]},"retained":false,"historicalAffected":[]}],"coverage":[]}