CVE-2026-40924 (GCVE-0-2026-40924)

Vulnerability from cvelistv5 – Published: 2026-04-21 20:47 – Updated: 2026-05-22 16:03
VLAI
Title
Tekton Pipelines: HTTP Resolver Unbounded Response Body Read Enables Denial of Service via Memory Exhaustion
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 HTTP resolver's FetchHttpResource function calls io.ReadAll(resp.Body) with no response body size limit. Any tenant with permission to create TaskRuns or PipelineRuns that reference the HTTP resolver can point it at an attacker-controlled HTTP server that returns a very large response body within the 1-minute timeout window, causing the tekton-pipelines-resolvers pod to be OOM-killed by Kubernetes. Because all resolver types (Git, Hub, Bundle, Cluster, HTTP) run in the same pod, crashing this pod denies resolution service to the entire cluster. Repeated exploitation causes a sustained crash loop. The same vulnerable code path is reached by both the deprecated pkg/resolution/resolver/http and the current pkg/remoteresolution/resolver/http implementations. Versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 fix the issue.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-22 13:21 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7856 records in the last 180 days details
References
Impacted products
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 Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-40924",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-22T13:21:18.942819Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-22T13:21:28.680Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-m2cx-gpqf-qf74"
          }
        ],
        "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, the HTTP resolver\u0027s FetchHttpResource function calls io.ReadAll(resp.Body) with no response body size limit. Any tenant with permission to create TaskRuns or PipelineRuns that reference the HTTP resolver can point it at an attacker-controlled HTTP server that returns a very large response body within the 1-minute timeout window, causing the tekton-pipelines-resolvers pod to be OOM-killed by Kubernetes. Because all resolver types (Git, Hub, Bundle, Cluster, HTTP) run in the same pod, crashing this pod denies resolution service to the entire cluster. Repeated exploitation causes a sustained crash loop. The same vulnerable code path is reached by both the deprecated pkg/resolution/resolver/http and the current pkg/remoteresolution/resolver/http implementations. 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": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-22T16:03:53.528Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-m2cx-gpqf-qf74",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-m2cx-gpqf-qf74"
        },
        {
          "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-m2cx-gpqf-qf74",
        "discovery": "UNKNOWN"
      },
      "title": "Tekton Pipelines: HTTP Resolver Unbounded Response Body Read Enables Denial of Service via Memory Exhaustion"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-40924",
    "datePublished": "2026-04-21T20:47:47.178Z",
    "dateReserved": "2026-04-15T20:40:15.517Z",
    "dateUpdated": "2026-05-22T16:03:53.528Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-40924",
      "date": "2026-11-15",
      "epss": "0.00318",
      "percentile": "0.25121"
    },
    "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, the HTTP resolver\u0027s FetchHttpResource function calls io.ReadAll(resp.Body) with no response body size limit. Any tenant with permission to create TaskRuns or PipelineRuns that reference the HTTP resolver can point it at an attacker-controlled HTTP server that returns a very large response body within the 1-minute timeout window, causing the tekton-pipelines-resolvers pod to be OOM-killed by Kubernetes. Because all resolver types (Git, Hub, Bundle, Cluster, HTTP) run in the same pod, crashing this pod denies resolution service to the entire cluster. Repeated exploitation causes a sustained crash loop. The same vulnerable code path is reached by both the deprecated pkg/resolution/resolver/http and the current pkg/remoteresolution/resolver/http implementations. 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, la funci\u00f3n FetchHttpResource del resolvedor HTTP llama a io.ReadAll(resp.Body) sin l\u00edmite de tama\u00f1o del cuerpo de la respuesta. Cualquier inquilino con permiso para crear TaskRuns o PipelineRuns que hagan referencia al resolvedor HTTP puede apuntarlo a un servidor HTTP controlado por un atacante que devuelva un cuerpo de respuesta muy grande dentro de la ventana de tiempo de espera de 1 minuto, lo que provoca que el pod tekton-pipelines-resolvers sea eliminado por OOM por Kubernetes. Debido a que todos los tipos de resolvedores (Git, Hub, Bundle, Cluster, HTTP) se ejecutan en el mismo pod, el fallo de este pod deniega el servicio de resoluci\u00f3n a todo el cl\u00faster. La explotaci\u00f3n repetida provoca un bucle de fallos sostenido. La misma ruta de c\u00f3digo vulnerable es alcanzada tanto por la implementaci\u00f3n obsoleta pkg/resolution/resolver/http como por la actual pkg/remoteresolution/resolver/http. Las versiones 1.0.2, 1.3.4, 1.6.2, 1.9.3 y 1.11.1 solucionan el problema."
          }
        ],
        "id": "CVE-2026-40924",
        "lastModified": "2026-10-26T22:10:00.163",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 6.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 3.6,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-40924",
                "options": [
                  {
                    "exploitation": "poc"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-22T13:21:18.942819Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-04-21T21:16:45.720",
        "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": [
              "Exploit",
              "Vendor Advisory"
            ],
            "url": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-m2cx-gpqf-qf74"
          },
          {
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "tags": [
              "Exploit",
              "Vendor Advisory"
            ],
            "url": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-m2cx-gpqf-qf74"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-400"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-15T11:52:21+00:00",
      "cve": "CVE-2026-40924",
      "id": "CVE-2026-40924",
      "initial_release_date": "2026-04-21T20:47:47.178000+00:00",
      "product_status:known_affected": "74",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "github.com/tektoncd/pipeline: Tekton Pipelines: Denial of Service via large HTTP response body",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40924.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-40924",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-04-22T13:21:18.942819Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-04-22T13:21:13.460Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "references": [
              {
                "tags": [
                  "exploit"
                ],
                "url": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-m2cx-gpqf-qf74"
              }
            ],
            "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, the HTTP resolver\u0027s FetchHttpResource function calls io.ReadAll(resp.Body) with no response body size limit. Any tenant with permission to create TaskRuns or PipelineRuns that reference the HTTP resolver can point it at an attacker-controlled HTTP server that returns a very large response body within the 1-minute timeout window, causing the tekton-pipelines-resolvers pod to be OOM-killed by Kubernetes. Because all resolver types (Git, Hub, Bundle, Cluster, HTTP) run in the same pod, crashing this pod denies resolution service to the entire cluster. Repeated exploitation causes a sustained crash loop. The same vulnerable code path is reached by both the deprecated pkg/resolution/resolver/http and the current pkg/remoteresolution/resolver/http implementations. 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": "HIGH",
                "baseScore": 6.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-400",
                  "description": "CWE-400: Uncontrolled Resource Consumption",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-22T16:03:53.528Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-m2cx-gpqf-qf74",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-m2cx-gpqf-qf74"
            },
            {
              "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-m2cx-gpqf-qf74",
            "discovery": "UNKNOWN"
          },
          "title": "Tekton Pipelines: HTTP Resolver Unbounded Response Body Read Enables Denial of Service via Memory Exhaustion"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-40924",
        "datePublished": "2026-04-21T20:47:47.178Z",
        "dateReserved": "2026-04-15T20:40:15.517Z",
        "dateUpdated": "2026-05-22T16:03:53.528Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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

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.

Loading timeline…




    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.