Medium 6.3HealthcarePublished Apr 21, 2026

CVE-2026-40942DSF: Inverted Time Comparison in OIDC JWKS and Token Cache

Updated under an hour ago (Oct 27, 2026, 10:50 AM ET)

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Exploited in the last 30 days

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.

CVSS: 6.3 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-670
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Apr 22, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

datasharingframework dsf datasharingframework:dsf (from the name)	before 2.1.0	CNA record
dev.dsf dsf-bpe-process-api-v2 dev.dsf:dsf_bpe_process_api_v2 (from the name)	before 2.1.0	CNA record
dev.dsf dsf-bpe-server dev.dsf:dsf_bpe_server (from the name)	before 2.1.0	CNA record

References

References

https://github.com/datasharingframework/dsf/security/advisories/GHSA-xmj9-7625-f634	x-refsource-confirm
https://github.com/datasharingframework/dsf/commit/31c2e974dfd4351756104ee8c53dbcd666192fef	x-refsource-misc
https://github.com/datasharingframework/dsf/commit/d3ca59b4daccde16a006fedeccce28fd1f826908	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.