Bug 2480675 (CVE-2026-39831) - CVE-2026-39831 golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Security key bypass due to missing user presence check
Summary: CVE-2026-39831 golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Security key...
Keywords:
Status: NEW
Alias: CVE-2026-39831
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-22 04:01 UTC by OSIDB Bzimport
Modified: 2026-07-07 14:01 UTC (History)
77 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-05-22 04:01:35 UTC 
The Verify() method for FIDO/U2F security key types (sk-ecdsa-sha2-nistp256, sk-ssh-ed25519) 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.
Note You need to log in before you can comment on or make changes to this bug.