{"id":"CVE-2026-41164","aliases":["GHSA-9hmg-827w-9rhj","GO-2026-5291"],"url":"https://o3.security/vulnerability/CVE-2026-41164","summary":"nuts-node: JWT type confusion in v1 access token introspection allows VP replay as access token","details":"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":"2026-05-26T17:35:59.019Z","modified":"2026-08-07T11:31:24.469698570Z","cvss":{"score":4.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/nuts-foundation/nuts-node","fixedVersion":null}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41164.json"},{"type":"ADVISORY","url":"https://github.com/nuts-foundation/nuts-node/security/advisories/GHSA-9hmg-827w-9rhj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41164"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:31:24.469698570Z"}}