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.
Published: 2026-05-26
Score: 4.4 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-9hmg-827w-9rhj nuts-node has JWT type confusion in v1 access token introspection that allows VP replay as access token
History

Wed, 27 May 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 27 May 2026 10:30:00 +0000

Type Values Removed Values Added
First Time appeared Nuts-foundation
Nuts-foundation nuts-node
Vendors & Products Nuts-foundation
Nuts-foundation nuts-node

Tue, 26 May 2026 18:00:00 +0000

Type Values Removed Values Added
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.
Title nuts-node: JWT type confusion in v1 access token introspection allows VP replay as access token
Weaknesses CWE-345
References
Metrics cvssV3_1

{'score': 4.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N'}


Subscriptions

Nuts-foundation Nuts-node
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-27T17:24:40.295Z

Reserved: 2026-04-17T16:34:45.525Z

Link: CVE-2026-41164

cve-icon Vulnrichment

Updated: 2026-05-27T17:24:36.457Z

cve-icon NVD

Status : Deferred

Published: 2026-05-26T18:16:47.683

Modified: 2026-06-17T10:46:15.657

Link: CVE-2026-41164

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-27T10:08:48Z

Weaknesses