CVE-2026-41164 json
nuts-node: JWT type confusion in v1 access token introspection allows VP replay as access token
published 2026-05-05 6 mo ago modified 2026-07-24 3 mo ago also GHSA-9hmg-827w-9rhj , GO-2026-5291 , EUVD-2026-31940
- cvss
- 4.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 0%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.08% chance of exploitation in the next 30 days, higher than 0% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.4 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N |
| GitHub | 3.1 | 4.4 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/nuts-foundation/nuts-node | <=1.1.0 all versions |
no fix listed |
Affected products
- nuts-foundation nuts-node
Classification
- Weakness
-
- CWE-345 Insufficient Verification of Data Authenticity
References
-
github.com
/nuts-foundation/nuts-node/security/advisories/GHSA-9hmg-827w-9rhj
web, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-41164
advisory
-
github.com
/nuts-foundation/nuts-node
package
-
github.com
/nuts-foundation/nuts-node/releases/tag/v5.4.31
web
-
github.com
/nuts-foundation/nuts-node/releases/tag/v6.2.3
web
Sources
- CVE List CVE-2026-41164
- GitHub Advisory GHSA-9hmg-827w-9rhj
- NVD CVE-2026-41164
- OSV GO-2026-5291
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