{"id":"GHSA-89gr-r52h-f8rx","summary":"golang.org/x/crypto: FIDO/U2F security key physical presence check can be bypassed","details":"The Verify() method for FIDO/U2F security key types (sk-ecdsa-sha2-nistp256@openssh.com, sk-ssh-ed25519@openssh.com) did not check the User Presence flag. Signatures generated without physical touch were accepted, allowing unattended use of a hardware security key. To restore the previous behavior, return a \"no-touch-required\" extension in Permissions.Extensions from PublicKeyCallback.","aliases":["CVE-2026-39831","GO-2026-5019"],"modified":"2026-07-17T21:17:04.144089341Z","published":"2026-06-25T22:21:12Z","database_specific":{"github_reviewed_at":"2026-06-25T22:21:12Z","nvd_published_at":"2026-05-22T04:16:22Z","cwe_ids":["CWE-862"],"severity":"CRITICAL","github_reviewed":true},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39831"},{"type":"PACKAGE","url":"https://cs.opensource.google/go/x/crypto"},{"type":"WEB","url":"https://go.dev/cl/781662"},{"type":"WEB","url":"https://go.dev/issue/79566"},{"type":"WEB","url":"https://groups.google.com/g/golang-announce/c/a082jnz-LvI"},{"type":"WEB","url":"https://pkg.go.dev/vuln/GO-2026-5019"}],"affected":[{"package":{"name":"golang.org/x/crypto","ecosystem":"Go","purl":"pkg:golang/golang.org/x/crypto"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.52.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-89gr-r52h-f8rx/GHSA-89gr-r52h-f8rx.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}