VIR Vulnerability Intelligence Relay

CVE-2026-39831

critical
Published 2026-05-22 · Modified 2026-06-02
💬 Discuss on Community ✚ Propose mitigation
CVSS v3
9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4 NEW
—
not yet in upstream
VIR risk
9.1

Description

The Verify() method for FIDO/U2F security key types (sk-ecdsa-sha2-nistp256@openssh.com, sk-ssh-ed25519@openssh.com) 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.

Predictions

Exploit likelihood
94%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact
suse SUSE Affected 1 release
VersionStatusFixed in
— Affected —
windows Windows Affected 1 release
VersionStatusFixed in
— Affected —
debian Debian Mixed 5 releases
VersionStatusFixed in
trixie Affected —
sid Fixed 1:0.52.0-1
forky Fixed 1:0.52.0-1
bullseye Affected —
bookworm Affected —

Package impact
EcosystemPackageVulnerableFixed
golang Gogolang.org/x/crypto<0.52.00.52.0

Application impact
VendorProductVersionsFixed
golang golangcrypto{"endExcluding":"0.52.0"}0.52.0

References

CWEs

CWE-862

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.