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CVE-2026-39831
Published: May 22, 2026
Modified: May 22, 2026
PUBLISHED
Description
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.
| Vendor | Product | Versions |
|---|---|---|
golang.org/x/crypto | golang.org/x/crypto/ssh | affected 0 - < 0.52.0 |
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