Vulnerability 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://go.dev/cl/781662
- https://go.dev/issue/79566
- https://groups.google.com/g/golang-announce/c/a082jnz-LvI
- https://pkg.go.dev/vuln/GO-2026-5019
FAQ
What is CVE-2026-39831?
CVE-2026-39831 is a documented vulnerability. 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 w...
How severe is CVE-2026-39831?
CVSS scoring is not yet available for CVE-2026-39831. Check NVD for updates.
Is there a patch for CVE-2026-39831?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.