CVE-2026-40942
CVE-2026-40942 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-670.
Key facts
- Severity: Medium (CVSS 4.0 base score 6.3)
- EPSS exploit prediction: 0% (21st percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-24496
- Weakness: CWE-670
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2026-40942?
- 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.
- How severe is CVE-2026-40942?
- CVE-2026-40942 has a CVSS 4.0 base score of 6.3, rated medium severity.
- Is CVE-2026-40942 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-40942?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-40942 have an EU (EUVD) identifier?
- Yes. CVE-2026-40942 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24496.
- When was CVE-2026-40942 published?
- CVE-2026-40942 was published on 2026-04-21 and last updated on 2026-06-17.
References
- https://github.com/datasharingframework/dsf/commit/31c2e974dfd4351756104ee8c53dbcd666192fef
- https://github.com/datasharingframework/dsf/commit/d3ca59b4daccde16a006fedeccce28fd1f826908
- https://github.com/datasharingframework/dsf/security/advisories/GHSA-xmj9-7625-f634
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