Vulnerability-Lookup

CVE-2026-40161 (GCVE-0-2026-40161)

Vulnerability from cvelistv5 – Published: 2026-04-21 16:26 – Updated: 2026-05-21 21:20

Title

Tekton Pipelines: Git resolver API mode leaks system-configured API token to user-controlled serverURL

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 Tekton Pipelines git resolver in API mode sends the system-configured Git API token to a user-controlled serverURL when the user omits the token parameter. A tenant with TaskRun or PipelineRun create permission can exfiltrate the shared API token (GitHub PAT, GitLab token, etc.) by pointing serverURL to an attacker-controlled endpoint. Versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 fix the issue.

Severity

7.7 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-21 17:41 UTC

CWE

CWE-201 - Insertion of Sensitive Information Into Sent Data

Assigner

GitHub_M CNA under the mitre root

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

References

3 references

URL	Tags
https://github.com/tektoncd/pipeline/security/adv…	x_refsource_CONFIRM
https://github.com/tektoncd/pipeline/issues/9608	x_refsource_MISC
https://github.com/tektoncd/pipeline/issues/9609	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

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}

CLEANSTART-2026-BW27317 (CVE-2026-40161)

Vulnerability from cleanstart – Published: 2026-09-18 09:56 – Updated: 2026-10-08 18:18 – Source website

Summary

Security fix for CVE-2026-40161 applied in: tekton-chains 0.25.2-r1, tekton-chains-fips 0.25.2-r1, tkn-fips 0.44.2-r0

Details

CVE-2026-40161 affects multiple packages. This issue is resolved in later releases. See references for individual vulnerability details.

Severity

6.5 (Medium)


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

References

URL

Type

	https://github.com/cleanstart-dev/cleanstart-secu…	ADVISORY
	https://osv.dev/vulnerability/CVE-2026-40161	WEB
	https://nvd.nist.gov/vuln/detail/CVE-2026-40161	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"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "tkn-fips",
        "purl": "pkg:apk/cleanstart/tkn-fips"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.44.2-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [],
  "database_specific": {},
  "details": "CVE-2026-40161 affects multiple packages. This issue is resolved in later releases. See references for individual vulnerability details.",
  "id": "CLEANSTART-2026-BW27317",
  "modified": "2026-10-08T18:18:10Z",
  "published": "2026-09-18T09:56:40.393131Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-BW27317.json"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/CVE-2026-40161"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40161"
    }
  ],
  "related": [],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Security fix for CVE-2026-40161 applied in: tekton-chains 0.25.2-r1, tekton-chains-fips 0.25.2-r1, tkn-fips 0.44.2-r0",
  "upstream": [
    "CVE-2026-40161"
  ]
}

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"
}

FKIE_CVE-2026-40161

Vulnerability from fkie_nvd - Published: 2026-04-21 17:16 - Updated: 2026-10-26 21:10

Severity

7.7 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/tektoncd/pipeline/issues/9608	Issue Tracking
security-advisories@github.com	https://github.com/tektoncd/pipeline/issues/9609	Issue Tracking
security-advisories@github.com	https://github.com/tektoncd/pipeline/security/advisories/GHSA-wjxp-xrpv-xpff	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": "4C365A15-24E6-468E-8A0F-27BA04AE4693",
              "versionEndIncluding": "1.10.0",
              "versionStartIncluding": "1.0.0",
              "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, the Tekton Pipelines git resolver in API mode sends the system-configured Git API token to a user-controlled serverURL when the user omits the token parameter. A tenant with TaskRun or PipelineRun create permission can exfiltrate the shared API token (GitHub PAT, GitLab token, etc.) by pointing serverURL to an attacker-controlled endpoint. 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. Desde la versi\u00f3n 1.0.0 hasta la 1.10.0, el resolvedor git de Tekton Pipelines en modo API env\u00eda el token API de Git configurado por el sistema a una serverURL controlada por el usuario cuando el usuario omite el par\u00e1metro de token. Un inquilino con permiso de creaci\u00f3n de TaskRun o PipelineRun puede exfiltrar el token API compartido (PAT de GitHub, token de GitLab, etc.) al apuntar la serverURL a un endpoint controlado por un atacante."
    }
  ],
  "id": "CVE-2026-40161",
  "lastModified": "2026-10-26T21:10:00.170",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.7,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 4.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-40161",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-21T17:41:32.164689Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-21T17:16:53.790",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://github.com/tektoncd/pipeline/issues/9608"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://github.com/tektoncd/pipeline/issues/9609"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-wjxp-xrpv-xpff"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-201"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

GHSA-WJXP-XRPV-XPFF

Vulnerability from github – Published: 2026-04-21 18:52 – Updated: 2026-05-21 21:18

Summary

Tekton Pipelines: Git resolver API mode leaks system-configured API token to user-controlled serverURL

Details

Summary

The Tekton Pipelines git resolver in API mode sends the system-configured Git API token to a user-controlled serverURL when the user omits the token parameter. A tenant with TaskRun or PipelineRun create permission can exfiltrate the shared API token (GitHub PAT, GitLab token, etc.) by pointing serverURL to an attacker-controlled endpoint.

Details

The git resolver's ResolveAPIGit() function in pkg/resolution/resolver/git/resolver.go constructs an SCM client using the user-supplied serverURL and a token obtained via getAPIToken().

When the user provides serverURL but omits the token parameter:

getSCMTypeAndServerURL() reads serverURL directly from user params (params[ServerURLParam]) with no validation against the system-configured URL.
secretRef is set to nil because the user did not provide a token parameter.
getAPIToken(ctx, nil, APISecretNameKey) is called. It detects apiSecret == nil, creates a new secretCacheKey, and populates it from the system-configured secret (conf.APISecretName / conf.APISecretNamespace / SYSTEM_NAMESPACE).
clientFunc(scmType, serverURL, string(apiToken)) creates an SCM client pointed at the attacker-controlled URL with the system token. The SCM factory sets the token as an Authorization header on the HTTP client.
All subsequent API calls (Contents.Find, Git.FindCommit) carry the system token to the attacker URL.

Impact

The system Git API token (GitHub PAT, GitLab token, etc.) is exfiltrated to an attacker-controlled endpoint. This token typically has read access to private repositories containing source code, secrets, and CI/CD configurations.

This follows the same threat model as GHSA-j5q5-j9gm-2w5c (published March 2026): a namespace-scoped tenant with permission to create TaskRuns exploits the git resolver to exfiltrate credentials. The prior advisory involved reading the resolver pod's ServiceAccount token via path traversal. This finding involves redirecting the system Git API token via serverURL.

Patches

Fixed in:

v1.0.2 (release-v1.0.x branch)
v1.3.4 (release-v1.3.x branch)
v1.6.2 (release-v1.6.x branch)
v1.9.3 (release-v1.9.x branch)
v1.11.1 (release-v1.11.x branch)

The fix validates that when serverURL is user-provided and differs from the system-configured server URL, the user must also provide their own token parameter. Using the system token with a non-system server URL is rejected.

Workarounds

Do not configure a system-level API token in the git resolver ConfigMap. Instead, require all users to provide their own tokens via the token parameter.
Restrict TaskRun creation — limit which users or ServiceAccounts can create TaskRuns and PipelineRuns that use the git resolver.
Network egress policies — apply NetworkPolicy to the tekton-pipelines-resolvers namespace to restrict outbound traffic to known-good Git servers only.

Affected Versions

All releases from v1.0.0 through v1.10.0, including all patch releases. The API mode of the git resolver has been present since the resolver was introduced.

Releases prior to v1.0.0 are not affected because the git resolver either did not exist or did not have API mode.

Acknowledgments

This vulnerability was reported by Koda Reef (@kodareef5), who provided a detailed analysis and proof-of-concept. Thank you!

References

Prior advisory: GHSA-j5q5-j9gm-2w5c
Related: #9608 (deprecate api-token-secret-namespace)
Related: #9609 (SubjectAccessReview for resolver secrets)

Severity

7.7 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/tektoncd/pipeline"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.0"
            },
            {
              "fixed": "1.0.2"
            }
          ],
          "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": "1.4.0"
            },
            {
              "fixed": "1.6.2"
            }
          ],
          "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": "1.10.0"
            },
            {
              "fixed": "1.11.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40161"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-201"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-21T18:52:18Z",
    "nvd_published_at": "2026-04-21T17:16:53Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nThe Tekton Pipelines git resolver in API mode sends the system-configured Git API token to a user-controlled `serverURL` when the user omits the `token` parameter. A tenant with TaskRun or PipelineRun create permission can exfiltrate the shared API token (GitHub PAT, GitLab token, etc.) by pointing `serverURL` to an attacker-controlled endpoint.\n\n### Details\n\nThe git resolver\u0027s `ResolveAPIGit()` function in `pkg/resolution/resolver/git/resolver.go` constructs an SCM client using the user-supplied `serverURL` and a token obtained via `getAPIToken()`.\n\nWhen the user provides `serverURL` but omits the `token` parameter:\n\n1. `getSCMTypeAndServerURL()` reads `serverURL` directly from user params (`params[ServerURLParam]`) with no validation against the system-configured URL.\n\n2. `secretRef` is set to `nil` because the user did not provide a token parameter.\n\n3. `getAPIToken(ctx, nil, APISecretNameKey)` is called. It detects `apiSecret == nil`, creates a new `secretCacheKey`, and populates it from the system-configured secret (`conf.APISecretName` / `conf.APISecretNamespace` / `SYSTEM_NAMESPACE`).\n\n4. `clientFunc(scmType, serverURL, string(apiToken))` creates an SCM client pointed at the attacker-controlled URL with the system token. The SCM factory sets the token as an `Authorization` header on the HTTP client.\n\n5. All subsequent API calls (`Contents.Find`, `Git.FindCommit`) carry the system token to the attacker URL.\n\n### Impact\n\nThe system Git API token (GitHub PAT, GitLab token, etc.) is exfiltrated to an attacker-controlled endpoint. This token typically has read access to private repositories containing source code, secrets, and CI/CD configurations.\n\nThis follows the same threat model as GHSA-j5q5-j9gm-2w5c (published March 2026): a namespace-scoped tenant with permission to create TaskRuns exploits the git resolver to exfiltrate credentials. The prior advisory involved reading the resolver pod\u0027s ServiceAccount token via path traversal. This finding involves redirecting the system Git API token via `serverURL`.\n\n### Patches\n\nFixed in:\n\n- v1.0.2 (release-v1.0.x branch)\n- v1.3.4 (release-v1.3.x branch)\n- v1.6.2 (release-v1.6.x branch)\n- v1.9.3 (release-v1.9.x branch)\n- v1.11.1 (release-v1.11.x branch)\n\nThe fix validates that when `serverURL` is user-provided and differs from the system-configured server URL, the user must also provide their own `token` parameter. Using the system token with a non-system server URL is rejected.\n\n### Workarounds\n\n- **Do not configure a system-level API token** in the git resolver ConfigMap. Instead, require all users to provide their own tokens via the `token` parameter.\n- **Restrict TaskRun creation** \u2014 limit which users or ServiceAccounts can create TaskRuns and PipelineRuns that use the git resolver.\n- **Network egress policies** \u2014 apply `NetworkPolicy` to the `tekton-pipelines-resolvers` namespace to restrict outbound traffic to known-good Git servers only.\n\n### Affected Versions\n\nAll releases from **v1.0.0** through **v1.10.0**, including all patch releases. The API mode of the git resolver has been present since the resolver was introduced.\n\nReleases prior to v1.0.0 are not affected because the git resolver either did not exist or did not have API mode.\n\n### Acknowledgments\n\nThis vulnerability was reported by Koda Reef (@kodareef5), who provided a detailed analysis and proof-of-concept. Thank you!\n\n### References\n\n- Prior advisory: [GHSA-j5q5-j9gm-2w5c](https://github.com/tektoncd/pipeline/security/advisories/GHSA-j5q5-j9gm-2w5c)\n- Related: #9608 (deprecate `api-token-secret-namespace`)\n- Related: #9609 (SubjectAccessReview for resolver secrets)",
  "id": "GHSA-wjxp-xrpv-xpff",
  "modified": "2026-05-21T21:18:57Z",
  "published": "2026-04-21T18:52:18Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-wjxp-xrpv-xpff"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40161"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tektoncd/pipeline/issues/9608"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tektoncd/pipeline/issues/9609"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/tektoncd/pipeline"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Tekton Pipelines: Git resolver API mode leaks system-configured API token to user-controlled serverURL"
}

RHSA-2026:24359

Vulnerability from csaf_redhat - Published: 2026-06-08 05:19 - Updated: 2026-11-13 11:34

Summary

Red Hat Security Advisory: Red Hat OpenShift Builds 1.7.3

Severity

Important

Scope

3 vulnerabilities in this advisory, including CVE-2026-40161.

CVE-2026-40161

A flaw was found in Tekton Pipelines. A tenant with permissions to create TaskRun or PipelineRun resources can exploit this vulnerability. By omitting the Git API token parameter and pointing the serverURL to an attacker-controlled endpoint, the system-configured Git API token (such as a GitHub Personal Access Token or GitLab token) can be sent to the attacker. This information disclosure allows for the exfiltration of sensitive API tokens.

7.7 (High)


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

Fixed: 24 products Known not affected: 13 products

https://access.redhat.com/errata/RHSA-2026:24359

Open the full advisory

RHSA-2026:24484

Vulnerability from csaf_redhat - Published: 2026-06-08 13:25 - Updated: 2026-11-13 12:41

Summary

Red Hat Security Advisory: Red Hat OpenShift Pipelines Release 1.21.2

Severity

Important

Scope

5 vulnerabilities in this advisory, including CVE-2026-40161.

CVE-2026-40161

7.7 (High)


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

Fixed: 8 products

https://access.redhat.com/errata/RHSA-2026:24484

Open the full advisory

RHSA-2026:89041

Vulnerability from csaf_redhat - Published: 2026-10-24 08:11 - Updated: 2026-11-14 04:47

Summary

Red Hat Security Advisory: Red Hat OpenShift Builds 1.9.2

Severity

Important

Scope

17 vulnerabilities in this advisory, including CVE-2026-40161.

CVE-2026-40161

7.7 (High)


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

Fixed: 5 products Known not affected: 32 products

https://access.redhat.com/errata/RHSA-2026:89041

Open the full advisory

RHSA-2026:89131

Vulnerability from csaf_redhat - Published: 2026-10-24 20:43 - Updated: 2026-11-14 04:47

Summary

Red Hat Security Advisory: Red Hat OpenShift Builds 1.9.2

Severity

Critical

Scope

18 vulnerabilities in this advisory, including CVE-2026-40161.

CVE-2026-40161

7.7 (High)


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

Fixed: 4 products Known not affected: 33 products

https://access.redhat.com/errata/RHSA-2026:89131

Open the full advisory

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-2026-40161 (GCVE-0-2026-40161)

CLEANSTART-2026-BW27317 (CVE-2026-40161)

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

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

FKIE_CVE-2026-40161

GHSA-WJXP-XRPV-XPFF

Summary

Details

Impact

Patches

Workarounds

Affected Versions

Acknowledgments

References

RHSA-2026:24359

RHSA-2026:24484

RHSA-2026:89041

RHSA-2026:89131

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour