Vulnerabilities CVE-2026-39831

CVE-2026-39831

None

Open

TLP:CLEAR

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

NVD CVE.org

Critical Infrastructure

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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.

Details

EPSS Score ⓘ: 0.42%

34.9th percentile
Confidence: 90%
Published: May 22, 2026
Last Modified: May 22, 2026

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