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CVE PROGRAM SOURCE RECORD4.4 Medium

CVE-2026-41164

nuts-node: JWT type confusion in v1 access token introspection allows VP replay as access token

Description

nuts-node is the reference implementation of the Nuts specification. Prior to 6.2.3 and 5.4.31, the v1 access token introspection endpoint (/auth/v1/introspect_access_token) accepts any JWT signed by a key present on the node, without validating the JWT type, issuer-to-key binding, or required claims. This allows a Verifiable Presentation (VP) JWT to be replayed as an access token and receive an active: true introspection response. This vulnerability is fixed in 6.2.3 and 5.4.31.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

nuts-foundation nuts-node

  • >= 6.0.0-alpha.1, < 6.2.3affected
  • < 5.4.31affected

References