CVE-2026-39831

ADVISORY - nist

Summary

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.

EPSS Score⁠: 0.00033 (0.100)

Common Weakness Enumeration (CWE)

ADVISORY - nist

CWE-862⁠

Missing Authorization

Impacted images

Advisories

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