{"id":"CVE-2026-40938","aliases":["GHSA-94jr-7pqp-xhcq","GO-2026-5272"],"url":"https://o3.security/vulnerability/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=<binary>. 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.","published":"2026-04-21T20:45:24.658Z","modified":"2026-08-05T03:47:15.940345354Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/tektoncd/pipeline","fixedVersion":"1.11.1"},{"ecosystem":"Go","name":"github.com/tektoncd/pipeline","fixedVersion":"1.9.3"},{"ecosystem":"Go","name":"github.com/tektoncd/pipeline","fixedVersion":"1.6.2"},{"ecosystem":"Go","name":"github.com/tektoncd/pipeline","fixedVersion":"1.3.4"},{"ecosystem":"Go","name":"github.com/tektoncd/pipeline","fixedVersion":"1.0.2"}],"fix":null,"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-05T03:47:15.940345354Z"}}