CVE-2026-39831
Vulnerability Description
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.
Vulnerability Details
Published Date
Last Modified
Source
NVD
Vendor
golang.org/x/crypto
Product
golang.org/x/crypto/ssh
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