Tekton Pipelines: Git Resolver Unsanitized Revision Parameter Enables git Argument Injection Leading to RCE

{
  "id": "92745942fdaa8913b7725c96b9fe0f71577ffa2aa816593d77d2369ddebba63a",
  "url": "https://osv.dev/vulnerability/CVE-2026-40938",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Tekton Pipelines: Git Resolver Unsanitized Revision Parameter Enables git Argument Injection Leading to RCE",
    "summary": "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=. 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.",
    "evidence": "osv:CVE-2026-40938",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-40938",
      "aliases": [
        "CVE-2026-40938",
        "GHSA-94jr-7pqp-xhcq",
        "GO-2026-5272"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/tektoncd/pipeline",
              "type": "GIT",
              "events": [
                {
                  "introduced": "d9974e2cce817a43c69789161f0824e05a7572af"
                },
                {
                  "fixed": "383d57b75e404e1f6f490ed62aba9d36a98a9ff6"
                },
                {
                  "fixed": "5a882817386c72d545a7448b0793a758c0eba6b1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:linuxfoundation:tekton_pipelines:*:*:*:*:*:go:*:*",
                    "range": [
                      {
                        "introduced": "1.0.0"
                      },
                      {
                        "fixed": "1.11.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5a882817386c72d545a7448b0793a758c0eba6b1"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.11.1"
                  }
                ]
              }
            }
          ],
          "versions": [
            "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/cve-osv-conversion/osv-output/CVE-2026-40938.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.109119154Z",
      "provider": "osv",
      "references": [
        "https://github.com/tektoncd/pipeline/releases/tag/v1.11.1",
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40938.json",
        "https://access.redhat.com/errata/RHSA-2026:17546",
        "https://access.redhat.com/errata/RHSA-2026:24359",
        "https://access.redhat.com/errata/RHSA-2026:24484",
        "https://access.redhat.com/errata/RHSA-2026:26519",
        "https://access.redhat.com/errata/RHSA-2026:26538",
        "https://access.redhat.com/security/cve/CVE-2026-40938",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40938.json",
        "https://github.com/tektoncd/pipeline/security/advisories/GHSA-94jr-7pqp-xhcq",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-40938",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2460292"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-88"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40938.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-40938",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517368,
  "published_at": "2026-04-21T20:45:24.658+00:00"
}