medium4.4
CVE-2026-41164
nuts-node has JWT type confusion in v1 access token introspection that allows VP replay as access token
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/nuts-foundation/nuts-node | <= 1.1.0 | none recorded |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-9hmg-827w-9rhj
- https://github.com/nuts-foundation/nuts-node/security/advisories/GHSA-9hmg-827w-9rhj
- https://github.com/nuts-foundation/nuts-node/releases/tag/v5.4.31
- https://github.com/nuts-foundation/nuts-node/releases/tag/v6.2.3
- https://nvd.nist.gov/vuln/detail/CVE-2026-41164