cvedb.io
CVE-2026-39831
CRITICAL · CVSS 9.1
EPSS exploitation probability: 0%
Published 2026-05-22T04:16:22.553 · Last modified 2026-06-17T10:42:39.630

Summary

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.

Affected products

golang — crypto

Does this affect you?

Add your gear to cvedb and we'll alert you only when golang ships something exploited.

Check my exposure →

References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.