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 7637 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

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FKIE_CVE-2026-40942

Vulnerability from fkie_nvd - Published: 2026-04-21 22:16 - Updated: 2026-06-17 10:45

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

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  "affected": [
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        {
          "product": "dsf",
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          "versions": [
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              "status": "affected",
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          "vendor": "dev.dsf",
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            },
            {
              "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

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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.

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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)

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Sightings

Nomenclature

Vulnerability timeline

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