{"id":"EUVD-2026-24481","revision":null,"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":[]},{"revision":"73227a416c13455f9faa4e4b4754543c","observedAt":"2026-11-01T07:05:15.256+00:00","statement":{"source":"euvd","id":"EUVD-2026-24481","aliases":["CVE-2026-40923","GHSA-rx35-6rhx-7858"],"title":"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 allow…","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":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD 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":null}],"references":["https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858","https://github.com/tektoncd/pipeline/releases/tag/v1.11.1"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-24481","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Apr 21, 2026, 8:50:53 PM","dateUpdated":"May 22, 2026, 3:41:51 PM"},"relatedAdvisories":[],"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-2026-24481","identifiers":["EUVD-2026-24481","CVE-2026-40923","GHSA-rx35-6rhx-7858"]},"retained":false,"historicalAffected":[]},{"revision":"82c392c316004839a0131ed06976dc8d","observedAt":"2026-10-27T10:10:07.342+00:00","statement":{"source":"nvd","id":"CVE-2026-40923","aliases":[],"title":"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 allow…","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":"2026-04-21T21:16:45.543+00:00","modifiedAt":"2026-10-26T22:10:00.163+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","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/releases/tag/v1.11.1","https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-40923","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Modified","weaknesses":["CWE-22"],"productCriteria":["cpe:2.3:a:linuxfoundation:tekton_pipelines:*:*:*:*:*:go:*:*"],"sourceDates":{"published":"2026-04-21T21:16:45.543","lastModified":"2026-10-26T22:10:00.163"},"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-2026-40923","identifiers":["CVE-2026-40923"]},"retained":false,"historicalAffected":[]},{"revision":"9ce81f08d1e541b6bbf8cce7f971733e","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-rx35-6rhx-7858","aliases":["CVE-2026-40923","GO-2026-5643"],"title":"Tekton Pipelines: VolumeMount path restriction bypass via missing filepath.Clean in /tekton/ check","description":"### Summary\n\nA validation bypass in the VolumeMount path restriction allows mounting\nvolumes under restricted `/tekton/` internal paths by using `..` path\ntraversal components. The restriction check uses `strings.HasPrefix`\nwithout `filepath.Clean`, so a path like `/tekton/home/../results`\npasses validation but resolves to `/tekton/results` at runtime.\n\n### Details\n\nTekton Pipelines restricts VolumeMount paths under `/tekton/` (except\n`/tekton/home`) to prevent users from interfering with internal\nexecution state. The validation at\n`pkg/apis/pipeline/v1/container_validation.go` checks mount paths using\n`strings.HasPrefix` without normalizing the path first:\n\n```go\nif strings.HasPrefix(vm.MountPath, \"/tekton/\") &&\n    !strings.HasPrefix(vm.MountPath, \"/tekton/home\") {\n    // reject\n}\n```\n\nBecause `/tekton/home` is an allowed prefix, a path like\n`/tekton/home/../results` passes both checks. At runtime, the container\nruntime resolves `..` and the actual mount point becomes\n`/tekton/results`.\n\nThe same pattern exists in `pkg/apis/pipeline/v1beta1/task_validation.go`.\n\n### Impact\n\nAn authenticated user with Task or TaskRun creation permissions can\nmount volumes over internal Tekton paths, potentially:\n\n- Writing fake task results that downstream pipelines trust\n- Reading or modifying step scripts before execution\n- Interfering with entrypoint coordination state\n\n### Patches\n\n_(to be filled: fixed in versions X.Y.Z)_\n\n### Workarounds\n\n- Use admission controllers (OPA/Gatekeeper, Kyverno) to validate that\n  VolumeMount paths do not contain `..` components.\n- In multi-tenant setups, restrict who can create Task and TaskRun\n  resources via RBAC.\n\n### Affected Versions\n\nAll versions through **v1.10.0** (both `v1` and `v1beta1` APIs).\n\n### Acknowledgments\n\nThis vulnerability was reported by @kodareef5.","state":0,"publishedAt":"2026-04-21T20:26:41+00:00","modifiedAt":"2026-09-10T03:51:03.0144675+00:00","affected":[{"ecosystem":"Go","name":"github.com/tektoncd/pipeline","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.10.0"},{"kind":"fixed","version":"1.11.1"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/tektoncd/pipeline","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.7.0"},{"kind":"fixed","version":"1.9.3"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/tektoncd/pipeline","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.4.0"},{"kind":"fixed","version":"1.6.2"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/tektoncd/pipeline","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.2.0"},{"kind":"fixed","version":"1.3.4"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/tektoncd/pipeline","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.0.0"},{"kind":"fixed","version":"1.0.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858","https://nvd.nist.gov/vuln/detail/CVE-2026-40923","https://github.com/tektoncd/pipeline","https://github.com/tektoncd/pipeline/releases/tag/v1.11.1"],"sourceUrl":"https://github.com/advisories/GHSA-rx35-6rhx-7858","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-rx35-6rhx-7858","identifiers":["GHSA-rx35-6rhx-7858","CVE-2026-40923","GO-2026-5643"]},"retained":false,"historicalAffected":[]},{"revision":"cfe26ad9ab2a408590f094ad3f32540e","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5643","aliases":["CVE-2026-40923","GHSA-rx35-6rhx-7858"],"title":"Tekton Pipelines VolumeMount path restriction bypass via missing filepath.Clean in github.com/tektoncd/pipeline","description":"Tekton Pipelines VolumeMount path restriction bypass via missing filepath.Clean in github.com/tektoncd/pipeline","state":0,"publishedAt":"2026-06-25T22:34:38+00:00","modifiedAt":"2026-07-23T19:15:17.1941239+00:00","affected":[{"ecosystem":"Go","name":"github.com/tektoncd/pipeline","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.0.0"},{"kind":"fixed","version":"1.0.2"},{"kind":"introduced","version":"1.1.0"},{"kind":"fixed","version":"1.3.4"},{"kind":"introduced","version":"1.4.0"},{"kind":"fixed","version":"1.6.2"},{"kind":"introduced","version":"1.7.0"},{"kind":"fixed","version":"1.9.3"},{"kind":"introduced","version":"1.10.0"},{"kind":"fixed","version":"1.11.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858","https://github.com/tektoncd/pipeline/releases/tag/v1.11.1"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5643","license":"OSV · upstream source license applies","key":"osv:GO-2026-5643","identifiers":["GO-2026-5643","CVE-2026-40923","GHSA-rx35-6rhx-7858"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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