Vulnerability-Lookup

CVE-2026-40923 (GCVE-0-2026-40923)

Vulnerability from cvelistv5 – Published: 2026-04-21 20:50 – Updated: 2026-05-22 15:41

Title

Tekton Pipelines: VolumeMount path restriction bypass via missing filepath.Clean in /tekton/ check

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, 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.

Severity

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-22 13:50 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7856 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/tektoncd/pipeline/security/adv…	x_refsource_CONFIRM
https://github.com/tektoncd/pipeline/releases/tag…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
tektoncd	pipeline	Affected: >= 1.0.0, < 1.0.2 Affected: >= 1.2.0, < 1.3.4 Affected: >= 1.4.0, < 1.6.2 Affected: >= 1.7.0, < 1.9.3 Affected: >= 1.10.0, < 1.11.1	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-40923",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-22T13:50:48.955785Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-22T13:51:13.268Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "pipeline",
          "vendor": "tektoncd",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.0.0, \u003c 1.0.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.2.0, \u003c 1.3.4"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.4.0, \u003c 1.6.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.7.0, \u003c 1.9.3"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.10.0, \u003c 1.11.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-22",
              "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-22T15:41:51.388Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858"
        },
        {
          "name": "https://github.com/tektoncd/pipeline/releases/tag/v1.11.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/tektoncd/pipeline/releases/tag/v1.11.1"
        }
      ],
      "source": {
        "advisory": "GHSA-rx35-6rhx-7858",
        "discovery": "UNKNOWN"
      },
      "title": "Tekton Pipelines: VolumeMount path restriction bypass via missing filepath.Clean in /tekton/ check"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-40923",
    "datePublished": "2026-04-21T20:50:53.742Z",
    "dateReserved": "2026-04-15T20:40:15.517Z",
    "dateUpdated": "2026-05-22T15:41:51.388Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-40923",
      "date": "2026-11-15",
      "epss": "0.0022",
      "percentile": "0.12681"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "pipeline",
                "vendor": "tektoncd",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003e= 1.0.0, \u003c 1.0.2"
                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 1.2.0, \u003c 1.3.4"
                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 1.4.0, \u003c 1.6.2"
                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 1.7.0, \u003c 1.9.3"
                  },
                  {
                    "status": "affected",
                    "version": "\u003e= 1.10.0, \u003c 1.11.1"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:linuxfoundation:tekton_pipelines:*:*:*:*:*:go:*:*",
                    "matchCriteriaId": "CC2C0633-AA1A-4CB5-8FA4-CD63381DCE11",
                    "versionEndExcluding": "1.11.1",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "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."
          },
          {
            "lang": "es",
            "value": "El proyecto Tekton Pipelines proporciona recursos estilo k8s para declarar pipelines estilo CI/CD. A partir de la versi\u00f3n 1.0.0 y antes de las versiones 1.0.2, 1.3.4, 1.6.2, 1.9.3 y 1.11.1, una omisi\u00f3n de validaci\u00f3n en la restricci\u00f3n de ruta de VolumeMount permite montar vol\u00famenes bajo rutas internas restringidas /tekton/ utilizando componentes de salto de ruta ... La comprobaci\u00f3n de la restricci\u00f3n utiliza strings.HasPrefix sin filepath.Clean, por lo que una ruta como /tekton/home/.. / results pasa la validaci\u00f3n pero se resuelve a /tekton/results en tiempo de ejecuci\u00f3n. Las versiones 1.0.2, 1.3.4, 1.6.2, 1.9.3 y 1.11.1 corrigen el problema."
          }
        ],
        "id": "CVE-2026-40923",
        "lastModified": "2026-10-26T22:10:00.163",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 5.4,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "LOW",
                "integrityImpact": "LOW",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 2.5,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-40923",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-22T13:50:48.955785Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-04-21T21:16:45.543",
        "references": [
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Release Notes"
            ],
            "url": "https://github.com/tektoncd/pipeline/releases/tag/v1.11.1"
          },
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-22"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-30T03:24:31+00:00",
      "cve": "CVE-2026-40923",
      "id": "CVE-2026-40923",
      "initial_release_date": "2026-04-21T20:50:53.742000+00:00",
      "product_status:known_affected": "57",
      "product_status:known_not_affected": "17",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "github.com/tektoncd/pipeline: Tekton Pipelines: Unauthorized access and information disclosure via path validation bypass",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40923.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-40923",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-04-22T13:50:48.955785Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-04-22T13:51:03.320Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "pipeline",
              "vendor": "tektoncd",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003e= 1.0.0, \u003c 1.0.2"
                },
                {
                  "status": "affected",
                  "version": "\u003e= 1.2.0, \u003c 1.3.4"
                },
                {
                  "status": "affected",
                  "version": "\u003e= 1.4.0, \u003c 1.6.2"
                },
                {
                  "status": "affected",
                  "version": "\u003e= 1.7.0, \u003c 1.9.3"
                },
                {
                  "status": "affected",
                  "version": "\u003e= 1.10.0, \u003c 1.11.1"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "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."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 5.4,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "LOW",
                "integrityImpact": "LOW",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-22",
                  "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-22T15:41:51.388Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858"
            },
            {
              "name": "https://github.com/tektoncd/pipeline/releases/tag/v1.11.1",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/tektoncd/pipeline/releases/tag/v1.11.1"
            }
          ],
          "source": {
            "advisory": "GHSA-rx35-6rhx-7858",
            "discovery": "UNKNOWN"
          },
          "title": "Tekton Pipelines: VolumeMount path restriction bypass via missing filepath.Clean in /tekton/ check"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-40923",
        "datePublished": "2026-04-21T20:50:53.742Z",
        "dateReserved": "2026-04-15T20:40:15.517Z",
        "dateUpdated": "2026-05-22T15:41:51.388Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

CLEANSTART-2026-HA54107 (GHSA-GCJH-H69Q-9W9G)

Vulnerability from cleanstart – Published: 2026-09-01 11:17 – Updated: 2026-09-18 11:59 – Source website

Withdrawn 2026-09-18

Summary

Security fixes in tekton-chains 0.25.2-r1

Details

Package tekton-chains version 0.25.2-r1 fixes 23 vulnerabilities: ghsa-gcjh-h69q-9w9g, ghsa-pmwq-pjrm-6p5r, CVE-2026-49478, CVE-2026-48702, CVE-2026-49834...

References

URL

Type

https://github.com/tektoncd/chains

WEB

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "tekton-chains"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.25.2-r1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.25.2-r1"
      ]
    }
  ],
  "credits": [],
  "database_specific": {},
  "details": "Package tekton-chains version 0.25.2-r1 fixes 23 vulnerabilities: ghsa-gcjh-h69q-9w9g, ghsa-pmwq-pjrm-6p5r, CVE-2026-49478, CVE-2026-48702, CVE-2026-49834...",
  "id": "CLEANSTART-2026-HA54107",
  "modified": "2026-09-18T11:59:01.768079Z",
  "published": "2026-09-01T11:17:16Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/tektoncd/chains"
    }
  ],
  "related": [],
  "schema_version": "1.7.3",
  "summary": "Security fixes in tekton-chains 0.25.2-r1",
  "upstream": [
    "ghsa-gcjh-h69q-9w9g",
    "ghsa-pmwq-pjrm-6p5r",
    "CVE-2026-49478",
    "CVE-2026-48702",
    "CVE-2026-49834",
    "CVE-2026-54787",
    "CVE-2026-39984",
    "CVE-2026-49835",
    "CVE-2026-40161",
    "CVE-2026-40938",
    "CVE-2026-25542",
    "CVE-2026-40923",
    "CVE-2026-40924",
    "CVE-2026-2303",
    "CVE-2026-39883",
    "ghsa-hrxh-6v49-42gf",
    "CVE-2026-56864",
    "CVE-2026-56865",
    "ghsa-259r-337f-4rfw",
    "ghsa-3fxj-6jh8-hvhx",
    "ghsa-9g5q-2w5x-hmxf",
    "ghsa-rjr7-jggh-pgcp",
    "CVE-2026-41178"
  ],
  "withdrawn": "2026-09-18T11:59:01.768079Z"
}

CLEANSTART-2026-NJ73427 (CVE-2026-39821)

Vulnerability from cleanstart – Published: 2026-09-01 11:17 – Updated: 2026-09-18 11:59 – Source website

Withdrawn 2026-09-18

Summary

Security fixes in tekton-chains-fips 0.25.2-r1

Details

Package tekton-chains-fips version 0.25.2-r1 fixes 31 vulnerabilities: CVE-2026-39821, CVE-2026-33818, CVE-2026-46600, CVE-2026-56853, CVE-2026-56858...

References

URL

Type

https://github.com/tektoncd/chains

WEB

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "tekton-chains-fips"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.25.2-r1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.25.2-r1"
      ]
    }
  ],
  "credits": [],
  "database_specific": {},
  "details": "Package tekton-chains-fips version 0.25.2-r1 fixes 31 vulnerabilities: CVE-2026-39821, CVE-2026-33818, CVE-2026-46600, CVE-2026-56853, CVE-2026-56858...",
  "id": "CLEANSTART-2026-NJ73427",
  "modified": "2026-09-18T11:59:01.768079Z",
  "published": "2026-09-01T11:17:16Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/tektoncd/chains"
    }
  ],
  "related": [],
  "schema_version": "1.7.3",
  "summary": "Security fixes in tekton-chains-fips 0.25.2-r1",
  "upstream": [
    "CVE-2026-39821",
    "CVE-2026-33818",
    "CVE-2026-46600",
    "CVE-2026-56853",
    "CVE-2026-56858",
    "CVE-2026-56859",
    "CVE-2026-56860",
    "CVE-2026-56862",
    "ghsa-gcjh-h69q-9w9g",
    "ghsa-pmwq-pjrm-6p5r",
    "CVE-2026-49478",
    "CVE-2026-48702",
    "CVE-2026-54787",
    "CVE-2026-49834",
    "CVE-2026-49835",
    "CVE-2026-39984",
    "CVE-2026-40161",
    "CVE-2026-40938",
    "CVE-2026-25542",
    "CVE-2026-40923",
    "CVE-2026-40924",
    "CVE-2026-2303",
    "CVE-2026-39883",
    "ghsa-hrxh-6v49-42gf",
    "CVE-2026-56865",
    "CVE-2026-56864",
    "ghsa-259r-337f-4rfw",
    "ghsa-rjr7-jggh-pgcp",
    "ghsa-3fxj-6jh8-hvhx",
    "ghsa-9g5q-2w5x-hmxf",
    "CVE-2026-41178"
  ],
  "withdrawn": "2026-09-18T11:59:01.768079Z"
}

CLEANSTART-2026-UI10829 (CVE-2026-40923)

Vulnerability from cleanstart – Published: 2026-09-18 09:44 – Updated: 2026-10-09 06:05 – Source website

Summary

Security fix for CVE-2026-40923 applied in: tekton-chains 0.25.2-r1, tekton-chains-fips 0.25.2-r1

Details

CVE-2026-40923 affects multiple packages. This issue is resolved in later releases. See references for individual vulnerability details.

Severity

5.4 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

References

URL

Type

	https://github.com/cleanstart-dev/cleanstart-secu…	ADVISORY
	https://osv.dev/vulnerability/CVE-2026-40923	WEB
	https://nvd.nist.gov/vuln/detail/CVE-2026-40923	WEB

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "tekton-chains",
        "purl": "pkg:apk/cleanstart/tekton-chains"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.25.2-r1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "tekton-chains-fips",
        "purl": "pkg:apk/cleanstart/tekton-chains-fips"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.25.2-r1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [],
  "database_specific": {},
  "details": "CVE-2026-40923 affects multiple packages. This issue is resolved in later releases. See references for individual vulnerability details.",
  "id": "CLEANSTART-2026-UI10829",
  "modified": "2026-10-09T06:05:14Z",
  "published": "2026-09-18T09:44:05.893003Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-UI10829.json"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/CVE-2026-40923"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40923"
    }
  ],
  "related": [],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Security fix for CVE-2026-40923 applied in: tekton-chains 0.25.2-r1, tekton-chains-fips 0.25.2-r1",
  "upstream": [
    "CVE-2026-40923"
  ]
}

FKIE_CVE-2026-40923

Vulnerability from fkie_nvd - Published: 2026-04-21 21:16 - Updated: 2026-10-26 22:10

Severity

5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/tektoncd/pipeline/releases/tag/v1.11.1	Release Notes
	security-advisories@github.com	https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858	Vendor Advisory

Impacted products

	Vendor	Product	Version
	linuxfoundation	tekton_pipelines	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "pipeline",
          "vendor": "tektoncd",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.0.0, \u003c 1.0.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.2.0, \u003c 1.3.4"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.4.0, \u003c 1.6.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.7.0, \u003c 1.9.3"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.10.0, \u003c 1.11.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:linuxfoundation:tekton_pipelines:*:*:*:*:*:go:*:*",
              "matchCriteriaId": "CC2C0633-AA1A-4CB5-8FA4-CD63381DCE11",
              "versionEndExcluding": "1.11.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "El proyecto Tekton Pipelines proporciona recursos estilo k8s para declarar pipelines estilo CI/CD. A partir de la versi\u00f3n 1.0.0 y antes de las versiones 1.0.2, 1.3.4, 1.6.2, 1.9.3 y 1.11.1, una omisi\u00f3n de validaci\u00f3n en la restricci\u00f3n de ruta de VolumeMount permite montar vol\u00famenes bajo rutas internas restringidas /tekton/ utilizando componentes de salto de ruta ... La comprobaci\u00f3n de la restricci\u00f3n utiliza strings.HasPrefix sin filepath.Clean, por lo que una ruta como /tekton/home/.. / results pasa la validaci\u00f3n pero se resuelve a /tekton/results en tiempo de ejecuci\u00f3n. Las versiones 1.0.2, 1.3.4, 1.6.2, 1.9.3 y 1.11.1 corrigen el problema."
    }
  ],
  "id": "CVE-2026-40923",
  "lastModified": "2026-10-26T22:10:00.163",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.5,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-40923",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-22T13:50:48.955785Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-21T21:16:45.543",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/tektoncd/pipeline/releases/tag/v1.11.1"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-RX35-6RHX-7858

Vulnerability from github – Published: 2026-04-21 20:26 – Updated: 2026-05-22 15:40

Summary

Tekton Pipelines: VolumeMount path restriction bypass via missing filepath.Clean in /tekton/ check

Details

Summary

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.

Details

Tekton Pipelines restricts VolumeMount paths under /tekton/ (except /tekton/home) to prevent users from interfering with internal execution state. The validation at pkg/apis/pipeline/v1/container_validation.go checks mount paths using strings.HasPrefix without normalizing the path first:

if strings.HasPrefix(vm.MountPath, "/tekton/") &&
    !strings.HasPrefix(vm.MountPath, "/tekton/home") {
    // reject
}

Because /tekton/home is an allowed prefix, a path like /tekton/home/../results passes both checks. At runtime, the container runtime resolves .. and the actual mount point becomes /tekton/results.

The same pattern exists in pkg/apis/pipeline/v1beta1/task_validation.go.

Impact

An authenticated user with Task or TaskRun creation permissions can mount volumes over internal Tekton paths, potentially:

Writing fake task results that downstream pipelines trust
Reading or modifying step scripts before execution
Interfering with entrypoint coordination state

Patches

(to be filled: fixed in versions X.Y.Z)

Workarounds

Use admission controllers (OPA/Gatekeeper, Kyverno) to validate that VolumeMount paths do not contain .. components.
In multi-tenant setups, restrict who can create Task and TaskRun resources via RBAC.

Affected Versions

All versions through v1.10.0 (both v1 and v1beta1 APIs).

Acknowledgments

This vulnerability was reported by @kodareef5.

Severity

5.4 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/tektoncd/pipeline"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.10.0"
            },
            {
              "fixed": "1.11.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/tektoncd/pipeline"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.7.0"
            },
            {
              "fixed": "1.9.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/tektoncd/pipeline"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.4.0"
            },
            {
              "fixed": "1.6.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/tektoncd/pipeline"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.2.0"
            },
            {
              "fixed": "1.3.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/tektoncd/pipeline"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.0"
            },
            {
              "fixed": "1.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40923"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-21T20:26:41Z",
    "nvd_published_at": "2026-04-21T21:16:45Z",
    "severity": "MODERATE"
  },
  "details": "### 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/\") \u0026\u0026\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.",
  "id": "GHSA-rx35-6rhx-7858",
  "modified": "2026-05-22T15:40:40Z",
  "published": "2026-04-21T20:26:41Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40923"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/tektoncd/pipeline"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tektoncd/pipeline/releases/tag/v1.11.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Tekton Pipelines: VolumeMount path restriction bypass via missing filepath.Clean in /tekton/ check"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-40923 (GCVE-0-2026-40923)

CLEANSTART-2026-HA54107 (GHSA-GCJH-H69Q-9W9G)

CLEANSTART-2026-NJ73427 (CVE-2026-39821)

CLEANSTART-2026-UI10829 (CVE-2026-40923)

FKIE_CVE-2026-40923

GHSA-RX35-6RHX-7858

Summary

Details

Impact

Patches

Workarounds

Affected Versions

Acknowledgments

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour