{"id":"CVE-2026-40938","summary":"Tekton Pipelines: Git Resolver Unsanitized Revision Parameter Enables git Argument Injection Leading to RCE","details":"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, the git resolver's revision parameter is passed directly as a positional argument to git fetch without any validation that it does not begin with a - character. Because git parses flags from mixed positional arguments, an attacker can inject arbitrary git fetch flags such as --upload-pack=\u003cbinary\u003e. Combined with the validateRepoURL function explicitly permitting URLs that begin with / (local filesystem paths), a tenant who can submit ResolutionRequest objects can chain these two behaviors to execute an arbitrary binary on the resolver pod. The tekton-pipelines-resolvers ServiceAccount holds cluster-wide get/list/watch on all Secrets, so code execution on the resolver pod enables full cluster-wide secret exfiltration. Versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 fix the issue.","aliases":["GHSA-94jr-7pqp-xhcq","GO-2026-5272"],"modified":"2026-09-08T03:30:42.292676657Z","published":"2026-04-21T20:45:24.658Z","related":["openSUSE-SU-2026:21483-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40938.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-88"]},"references":[{"type":"WEB","url":"https://github.com/tektoncd/pipeline/releases/tag/v1.11.1"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40938.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:17546"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24359"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24484"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26519"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:26538"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-40938"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40938.json"},{"type":"ADVISORY","url":"https://github.com/tektoncd/pipeline/security/advisories/GHSA-94jr-7pqp-xhcq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40938"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2460292"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/tektoncd/pipeline","events":[{"introduced":"d9974e2cce817a43c69789161f0824e05a7572af"},{"fixed":"383d57b75e404e1f6f490ed62aba9d36a98a9ff6"},{"fixed":"5a882817386c72d545a7448b0793a758c0eba6b1"}],"database_specific":{"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:linuxfoundation:tekton_pipelines:*:*:*:*:*:go:*:*","extracted_events":[{"introduced":"1.0.0"},{"fixed":"1.11.0"}]}}],"versions":["v1.11.0","v1.10.0","v1.9.0","v1.6.0","v1.7.0","v1.5.0","v1.4.0","v1.3.0","v1.2.0","v1.0.0","v1.1.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-40938.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}