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Invoking bypass of FIDO/U2F security keys physical interaction in golang.org/x/crypto/ssh

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-39831

Published

The Verify() method for FIDO/U2F security key types ([email protected], [email protected]) 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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-39831

Published

golang.org/x/crypto/ssh

https://pkg.go.dev

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "golang.org/x/crypto",
                    "product": "golang.org/x/crypto/ssh",
                    "collectionURL": "https://pkg.go.dev",
                    "packageName": "golang.org/x/crypto/ssh",
                    "versions": [
                        {
                            "version": "0",
                            "lessThan": "0.52.0",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "programRoutines": [
                        {
                            "name": "CertChecker.CheckCert"
                        },
                        {
                            "name": "skECDSAPublicKey.Verify"
                        },
                        {
                            "name": "skEd25519PublicKey.Verify"
                        },
                        {
                            "name": "connection.serverAuthenticate"
                        },
                        {
                            "name": "CertChecker.Authenticate"
                        },
                        {
                            "name": "CertChecker.CheckHostKey"
                        },
                        {
                            "name": "Certificate.Verify"
                        },
                        {
                            "name": "Dial"
                        },
                        {
                            "name": "NewClientConn"
                        },
                        {
                            "name": "NewServerConn"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON

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Sources read 15 Nov 18:02 UTC · 254 of 275 readable · 250 fully read · documentation 469/469 current