Security Advisory

CVE-2026-39831

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-05-22 02:31:27

Last updated 2026-05-22 18:52:08

Assigner Go

CVSS score not scored

State PUBLISHED

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.

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