CVE-2026-39831

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.

References

https://pkg.go.dev/vuln/GO-2026-5019

https://groups.google.com/g/golang-announce/c/a082jnz-LvI

https://go.dev/issue/79566

https://go.dev/cl/781662

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3