| { |
| "schema_version": "1.3.1", |
| "id": "GO-2026-5019", |
| "modified": "0001-01-01T00:00:00Z", |
| "published": "0001-01-01T00:00:00Z", |
| "aliases": [ |
| "CVE-2026-39831" |
| ], |
| "summary": "Invoking bypass of FIDO/U2F security keys physical interaction in golang.org/x/crypto/ssh", |
| "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.", |
| "affected": [ |
| { |
| "package": { |
| "name": "golang.org/x/crypto", |
| "ecosystem": "Go" |
| }, |
| "ranges": [ |
| { |
| "type": "SEMVER", |
| "events": [ |
| { |
| "introduced": "0" |
| }, |
| { |
| "fixed": "0.52.0" |
| } |
| ] |
| } |
| ], |
| "ecosystem_specific": { |
| "imports": [ |
| { |
| "path": "golang.org/x/crypto/ssh", |
| "symbols": [ |
| "CertChecker.Authenticate", |
| "CertChecker.CheckCert", |
| "CertChecker.CheckHostKey", |
| "Certificate.Verify", |
| "Dial", |
| "NewClientConn", |
| "NewServerConn", |
| "connection.serverAuthenticate", |
| "skECDSAPublicKey.Verify", |
| "skEd25519PublicKey.Verify" |
| ] |
| } |
| ] |
| } |
| } |
| ], |
| "references": [ |
| { |
| "type": "REPORT", |
| "url": "https://go.dev/issue/79566" |
| }, |
| { |
| "type": "WEB", |
| "url": "https://groups.google.com/g/golang-announce/c/a082jnz-LvI" |
| }, |
| { |
| "type": "FIX", |
| "url": "https://go.dev/cl/781662" |
| } |
| ], |
| "credits": [ |
| { |
| "name": "NCC Group Cryptography Services, sponsored by Teleport" |
| } |
| ], |
| "database_specific": { |
| "url": "https://pkg.go.dev/vuln/GO-2026-5019", |
| "review_status": "REVIEWED" |
| } |
| } |
