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9.8

Loki may accept forged security key signatures

published 23 days ago
Summary

The Loki software package used by cleanstart can incorrectly verify signatures from certain hardware security keys. This could let an attacker pretend to be a legitimate user. Update Loki to the latest version or apply the vendor's patch as soon as possible.

What to do
  • Update cleanstart loki to version 3.7.1-r1.
Affected software
Ecosystem VendorProductAffected versions
CleanStart cleanstart loki < 3.7.1-r1
Fix: upgrade to 3.7.1-r1
Original advisory text
Verify() method for FIDO/U2F security key types (sk-ecdsa-sha2-nistp256@openssh
Security vulnerability affects the loki package. The Verify() method for FIDO/U2F security key types (sk-ecdsa-sha2-nistp256@openssh.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker full control (estimated)
Severity
9.8 Critical
Timeline
Published26 Sep 2026
Updated26 Sep 2026
First seen26 Sep 2026
Sources
CLEANSTART-2026-SR68419 · OSV
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