Vulnerability-Lookup

CVE-2026-40942 (GCVE-0-2026-40942)

Vulnerability from cvelistv5 – Published: 2026-04-21 21:09 – Updated: 2026-04-22 18:11

Title

DSF: Inverted Time Comparison in OIDC JWKS and Token Cache

Summary

The Data Sharing Framework (DSF) implements a distributed process engine based on the BPMN 2.0 and FHIR R4 standards. Prior to 2.1.0, The OIDC JWKS and Metadata Document caches used an inverted time comparison (isBefore instead of isAfter), causing the cache to never return cached values. Every incoming request triggered a fresh HTTP fetch of the OIDC Metadata Document and JWKS keys from the OIDC provider. The OIDC token cache for the FHIR client connections used an inverted time comparison (isBefore instead of isAfter), causing the cache to never invalidate. Every incoming request returned the same OIDC token even if expired. This vulnerability is fixed in 2.1.0.

Severity

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-22 17:52 UTC

CWE

CWE-670 - Always-Incorrect Control Flow Implementation

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7763 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/datasharingframework/dsf/secur…	x_refsource_CONFIRM
https://github.com/datasharingframework/dsf/commi…	x_refsource_MISC
https://github.com/datasharingframework/dsf/commi…	x_refsource_MISC

Impacted products

3 products

Vendor	Product	Version	CPE status
datasharingframework	dsf	Affected: < 2.1.0	guessed
dev.dsf	dsf-bpe-process-api-v2	Affected: < 2.1.0	guessed
dev.dsf	dsf-bpe-server	Affected: < 2.1.0	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-40942",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-22T17:52:51.070590Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-22T18:11:33.794Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "dsf",
          "vendor": "datasharingframework",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.1.0"
            }
          ]
        },
        {
          "product": "dsf-bpe-process-api-v2",
          "vendor": "dev.dsf",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.1.0"
            }
          ]
        },
        {
          "product": "dsf-bpe-server",
          "vendor": "dev.dsf",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.1.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The Data Sharing Framework (DSF) implements a distributed process engine based on the BPMN 2.0 and FHIR R4 standards. Prior to 2.1.0, The OIDC JWKS and Metadata Document caches used an inverted time comparison (isBefore instead of isAfter), causing the cache to never return cached values. Every incoming request triggered a fresh HTTP fetch of the OIDC Metadata Document and JWKS keys from the OIDC provider. The OIDC token cache for the FHIR client connections used an inverted time comparison (isBefore instead of isAfter), causing the cache to never invalidate. Every incoming request returned the same OIDC token even if expired. This vulnerability is fixed in 2.1.0."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-670",
              "description": "CWE-670: Always-Incorrect Control Flow Implementation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-21T21:09:44.537Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/datasharingframework/dsf/security/advisories/GHSA-xmj9-7625-f634",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/datasharingframework/dsf/security/advisories/GHSA-xmj9-7625-f634"
        },
        {
          "name": "https://github.com/datasharingframework/dsf/commit/31c2e974dfd4351756104ee8c53dbcd666192fef",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/datasharingframework/dsf/commit/31c2e974dfd4351756104ee8c53dbcd666192fef"
        },
        {
          "name": "https://github.com/datasharingframework/dsf/commit/d3ca59b4daccde16a006fedeccce28fd1f826908",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/datasharingframework/dsf/commit/d3ca59b4daccde16a006fedeccce28fd1f826908"
        }
      ],
      "source": {
        "advisory": "GHSA-xmj9-7625-f634",
        "discovery": "UNKNOWN"
      },
      "title": "DSF: Inverted Time Comparison in OIDC JWKS and Token Cache"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-40942",
    "datePublished": "2026-04-21T21:09:44.537Z",
    "dateReserved": "2026-04-15T20:40:15.519Z",
    "dateUpdated": "2026-04-22T18:11:33.794Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-40942",
      "date": "2026-11-11",
      "epss": "0.00291",
      "percentile": "0.2198"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "dsf",
                "vendor": "datasharingframework",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 2.1.0"
                  }
                ]
              },
              {
                "product": "dsf-bpe-process-api-v2",
                "vendor": "dev.dsf",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 2.1.0"
                  }
                ]
              },
              {
                "product": "dsf-bpe-server",
                "vendor": "dev.dsf",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 2.1.0"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "The Data Sharing Framework (DSF) implements a distributed process engine based on the BPMN 2.0 and FHIR R4 standards. Prior to 2.1.0, The OIDC JWKS and Metadata Document caches used an inverted time comparison (isBefore instead of isAfter), causing the cache to never return cached values. Every incoming request triggered a fresh HTTP fetch of the OIDC Metadata Document and JWKS keys from the OIDC provider. The OIDC token cache for the FHIR client connections used an inverted time comparison (isBefore instead of isAfter), causing the cache to never invalidate. Every incoming request returned the same OIDC token even if expired. This vulnerability is fixed in 2.1.0."
          },
          {
            "lang": "es",
            "value": "El Data Sharing Framework (DSF) implementa un motor de procesos distribuido basado en los est\u00e1ndares BPMN 2.0 y FHIR R4. Antes de la versi\u00f3n 2.1.0, las cach\u00e9s de OIDC JWKS y del Documento de Metadatos utilizaban una comparaci\u00f3n de tiempo invertida (isBefore en lugar de isAfter), lo que provocaba que la cach\u00e9 nunca devolviera valores almacenados en cach\u00e9. Cada solicitud entrante activaba una nueva recuperaci\u00f3n HTTP del Documento de Metadatos de OIDC y las claves JWKS del proveedor de OIDC. La cach\u00e9 de tokens de OIDC para las conexiones de cliente FHIR utilizaba una comparaci\u00f3n de tiempo invertida (isBefore en lugar de isAfter), lo que provocaba que la cach\u00e9 nunca se invalidara. Cada solicitud entrante devolv\u00eda el mismo token de OIDC incluso si estaba caducado. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 2.1.0."
          }
        ],
        "id": "CVE-2026-40942",
        "lastModified": "2026-10-26T22:10:00.163",
        "metrics": {
          "cvssMetricV40": [
            {
              "cvssData": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "availabilityRequirement": "NOT_DEFINED",
                "baseScore": 6.3,
                "baseSeverity": "MEDIUM",
                "confidentialityRequirement": "NOT_DEFINED",
                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
                "version": "4.0",
                "vulnAvailabilityImpact": "LOW",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "NONE",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-40942",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-22T17:52:51.070590Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-04-21T22:16:19.700",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/datasharingframework/dsf/commit/31c2e974dfd4351756104ee8c53dbcd666192fef"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/datasharingframework/dsf/commit/d3ca59b4daccde16a006fedeccce28fd1f826908"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/datasharingframework/dsf/security/advisories/GHSA-xmj9-7625-f634"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-670"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2026-06-05T19:27:21+00:00",
      "cve": "CVE-2026-40942",
      "id": "CVE-2026-40942",
      "initial_release_date": "2026-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "DSF: Inverted Time Comparison in OIDC JWKS and Token Cache",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40942.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-40942",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-04-22T17:52:51.070590Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-04-22T18:09:06.207Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "dsf",
              "vendor": "datasharingframework",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 2.1.0"
                }
              ]
            },
            {
              "product": "dsf-bpe-process-api-v2",
              "vendor": "dev.dsf",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 2.1.0"
                }
              ]
            },
            {
              "product": "dsf-bpe-server",
              "vendor": "dev.dsf",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 2.1.0"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "The Data Sharing Framework (DSF) implements a distributed process engine based on the BPMN 2.0 and FHIR R4 standards. Prior to 2.1.0, The OIDC JWKS and Metadata Document caches used an inverted time comparison (isBefore instead of isAfter), causing the cache to never return cached values. Every incoming request triggered a fresh HTTP fetch of the OIDC Metadata Document and JWKS keys from the OIDC provider. The OIDC token cache for the FHIR client connections used an inverted time comparison (isBefore instead of isAfter), causing the cache to never invalidate. Every incoming request returned the same OIDC token even if expired. This vulnerability is fixed in 2.1.0."
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "attackComplexity": "LOW",
                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "baseScore": 6.3,
                "baseSeverity": "MEDIUM",
                "privilegesRequired": "NONE",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
                "version": "4.0",
                "vulnAvailabilityImpact": "LOW",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "NONE"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-670",
                  "description": "CWE-670: Always-Incorrect Control Flow Implementation",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-04-21T21:09:44.537Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/datasharingframework/dsf/security/advisories/GHSA-xmj9-7625-f634",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/datasharingframework/dsf/security/advisories/GHSA-xmj9-7625-f634"
            },
            {
              "name": "https://github.com/datasharingframework/dsf/commit/31c2e974dfd4351756104ee8c53dbcd666192fef",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/datasharingframework/dsf/commit/31c2e974dfd4351756104ee8c53dbcd666192fef"
            },
            {
              "name": "https://github.com/datasharingframework/dsf/commit/d3ca59b4daccde16a006fedeccce28fd1f826908",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/datasharingframework/dsf/commit/d3ca59b4daccde16a006fedeccce28fd1f826908"
            }
          ],
          "source": {
            "advisory": "GHSA-xmj9-7625-f634",
            "discovery": "UNKNOWN"
          },
          "title": "DSF: Inverted Time Comparison in OIDC JWKS and Token Cache"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-40942",
        "datePublished": "2026-04-21T21:09:44.537Z",
        "dateReserved": "2026-04-15T20:40:15.519Z",
        "dateUpdated": "2026-04-22T18:11:33.794Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-40942

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

Severity

6.3 (Medium) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/datasharingframework/dsf/commit/31c2e974dfd4351756104ee8c53dbcd666192fef
	security-advisories@github.com	https://github.com/datasharingframework/dsf/commit/d3ca59b4daccde16a006fedeccce28fd1f826908
	security-advisories@github.com	https://github.com/datasharingframework/dsf/security/advisories/GHSA-xmj9-7625-f634

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "dsf",
          "vendor": "datasharingframework",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.1.0"
            }
          ]
        },
        {
          "product": "dsf-bpe-process-api-v2",
          "vendor": "dev.dsf",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.1.0"
            }
          ]
        },
        {
          "product": "dsf-bpe-server",
          "vendor": "dev.dsf",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.1.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Data Sharing Framework (DSF) implements a distributed process engine based on the BPMN 2.0 and FHIR R4 standards. Prior to 2.1.0, The OIDC JWKS and Metadata Document caches used an inverted time comparison (isBefore instead of isAfter), causing the cache to never return cached values. Every incoming request triggered a fresh HTTP fetch of the OIDC Metadata Document and JWKS keys from the OIDC provider. The OIDC token cache for the FHIR client connections used an inverted time comparison (isBefore instead of isAfter), causing the cache to never invalidate. Every incoming request returned the same OIDC token even if expired. This vulnerability is fixed in 2.1.0."
    },
    {
      "lang": "es",
      "value": "El Data Sharing Framework (DSF) implementa un motor de procesos distribuido basado en los est\u00e1ndares BPMN 2.0 y FHIR R4. Antes de la versi\u00f3n 2.1.0, las cach\u00e9s de OIDC JWKS y del Documento de Metadatos utilizaban una comparaci\u00f3n de tiempo invertida (isBefore en lugar de isAfter), lo que provocaba que la cach\u00e9 nunca devolviera valores almacenados en cach\u00e9. Cada solicitud entrante activaba una nueva recuperaci\u00f3n HTTP del Documento de Metadatos de OIDC y las claves JWKS del proveedor de OIDC. La cach\u00e9 de tokens de OIDC para las conexiones de cliente FHIR utilizaba una comparaci\u00f3n de tiempo invertida (isBefore en lugar de isAfter), lo que provocaba que la cach\u00e9 nunca se invalidara. Cada solicitud entrante devolv\u00eda el mismo token de OIDC incluso si estaba caducado. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 2.1.0."
    }
  ],
  "id": "CVE-2026-40942",
  "lastModified": "2026-10-26T22:10:00.163",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "LOW",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-40942",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-22T17:52:51.070590Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-21T22:16:19.700",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/datasharingframework/dsf/commit/31c2e974dfd4351756104ee8c53dbcd666192fef"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/datasharingframework/dsf/commit/d3ca59b4daccde16a006fedeccce28fd1f826908"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/datasharingframework/dsf/security/advisories/GHSA-xmj9-7625-f634"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-670"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-XMJ9-7625-F634

Vulnerability from github – Published: 2026-04-15 19:19 – Updated: 2026-04-24 20:39

Summary

Data Sharing Framework has an Inverted Time Comparison in OIDC JWKS and Token Cache

Details

Affected Components

DSF FHIR Server with enabled bearer-token authentication or back-channel logout.
DSF BPE Server with enabled bearer-token authentication or back-channel logout.
DSF BPE Server API v2 process plugins using FHIR client connections with configured OIDC authentication.

Summary

The OIDC JWKS and Metadata Document caches used an inverted time comparison (isBefore instead of isAfter), causing the cache to never return cached values. Every incoming request triggered a fresh HTTP fetch of the OIDC Metadata Document and JWKS keys from the OIDC provider.
The OIDC token cache for the FHIR client connections used an inverted time comparison (isBefore instead of isAfter), causing the cache to never invalidate. Every incoming request returned the same OIDC token even if expired.

Impact

Performance: Every OIDC-authenticated request added network round-trips to the OIDC provider, increasing latency
Reliability: Cached OIDC tokens become unusable after expiration and can only be invalidated by restart of the BPE. If the OIDC provider is temporarily unreachable, all requests fail immediately instead of using cached keys
Load: Unnecessary load on the OIDC provider, potentially causing rate limiting

Fix (commits 31c2e974d, d3ca59b4d)

Fixed cache timeout comparison from isBefore to isAfter in BaseOidcClientWithCache (configuration and JWKS caches) and OidcClientWithCache (configuration, JWKS, and access token caches)
Added configurable cache timeouts via dev.dsf.server.auth.oidc.provider.client.cache.timeout.configuration.resource and dev.dsf.server.auth.oidc.provider.client.cache.timeout.jwks.resource (default: PT1H)

Severity

6.3 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 2.1.0"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "dev.dsf:dsf-bpe-process-api-v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 2.1.0"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "dev.dsf:dsf-bpe-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40942"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-670"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-15T19:19:50Z",
    "nvd_published_at": "2026-04-21T22:16:19Z",
    "severity": "MODERATE"
  },
  "details": "### Affected Components\n- DSF FHIR Server with enabled [bearer-token authentication](https://dsf.dev/operations/v2.1.0/fhir/oidc.html) or [back-channel logout](https://dsf.dev/operations/v2.1.0/fhir/oidc.html).\n- DSF BPE Server with enabled [bearer-token authentication](https://dsf.dev/operations/v2.1.0/bpe/oidc.html) or [back-channel logout](https://dsf.dev/operations/v2.1.0/bpe/oidc.html).\n- DSF BPE Server API v2 process plugins using [FHIR client connections](https://dsf.dev/operations/v2.1.0/bpe/fhir-client-connections.html) with configured OIDC authentication.\n\n### Summary\n- The OIDC JWKS and Metadata Document caches used an inverted time comparison (`isBefore` instead of `isAfter`), causing the cache to **never return cached values**. Every incoming request triggered a fresh HTTP fetch of the OIDC Metadata Document and JWKS keys from the OIDC provider.\n- The OIDC token cache for the [FHIR client connections](https://dsf.dev/operations/v2.1.0/bpe/fhir-client-connections.html) used an inverted time comparison (`isBefore` instead of `isAfter`), causing the cache to **never invalidate**. Every incoming request returned the same OIDC token even if expired.\n\n### Impact\n- **Performance:** Every OIDC-authenticated request added network round-trips to the OIDC provider, increasing latency\n- **Reliability:** Cached OIDC tokens become unusable after expiration and can only be invalidated by restart of the BPE. \n If the OIDC provider is temporarily unreachable, all requests fail immediately instead of using cached keys\n- **Load:** Unnecessary load on the OIDC provider, potentially causing rate limiting\n\n### Fix (commits 31c2e974d, d3ca59b4d)\n- Fixed cache timeout comparison from `isBefore` to `isAfter` in `BaseOidcClientWithCache` (configuration and JWKS caches) and `OidcClientWithCache` (configuration, JWKS, and access token caches)\n- Added configurable cache timeouts via `dev.dsf.server.auth.oidc.provider.client.cache.timeout.configuration.resource` and `dev.dsf.server.auth.oidc.provider.client.cache.timeout.jwks.resource` (default: `PT1H`)",
  "id": "GHSA-xmj9-7625-f634",
  "modified": "2026-04-24T20:39:38Z",
  "published": "2026-04-15T19:19:50Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/datasharingframework/dsf/security/advisories/GHSA-xmj9-7625-f634"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40942"
    },
    {
      "type": "WEB",
      "url": "https://github.com/datasharingframework/dsf/commit/31c2e974dfd4351756104ee8c53dbcd666192fef"
    },
    {
      "type": "WEB",
      "url": "https://github.com/datasharingframework/dsf/commit/d3ca59b4daccde16a006fedeccce28fd1f826908"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/datasharingframework/dsf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Data Sharing Framework has an Inverted Time Comparison in OIDC JWKS and Token Cache"
}

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-2026-40942 (GCVE-0-2026-40942)

FKIE_CVE-2026-40942

GHSA-XMJ9-7625-F634

Affected Components

Summary

Impact

Fix (commits 31c2e974d, d3ca59b4d)

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour