CVE-2026-40947
LOW
2.9
CVSS Score
Published: April 15, 2026 at 11:13 PM UTC
Updated: October 26, 2026 at 09:10 PM UTC
3 products affected across 1 vendorYubiKey ManagerPython FIDO2LIBFIDO2
Using libfido2 by Yubico?
Get instant alerts when new vulnerabilities affect libfido2 - before attackers find them.
Real-time alertsTrack your software stackFree plan available
Severity
LOW2.9
Exploit prediction
EPSS 0.1%
SSVC
No known exploit
Description
Yubico libfido2 before 1.17.0, python-fido2 before 2.2.0, and yubikey-manager before 5.9.1 have an unintended DLL search path.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 1.17.0
Affected range stops below 1.17.0, so it looks safe — our inference, not a vendor statement
v < 2.2.0
Affected range stops below 2.2.0, so it looks safe — our inference, not a vendor statement
v < 5.9.1
Affected range stops below 5.9.1, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.
References (1)
Source: cverecord
https://www.yubico.com/support/security-advisories/ysa-2026-01/SSVC — Action Prioritization
SSVCNo known exploitNot automatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
2.9LOWmitre
- Attack Vector
- LOCAL
- Complexity
- HIGH
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- LOW
- Availability
- NONE
Vector?
Quick Info
StatusAWAITING ANALYSIS
CWE
CWE-426
Get alerted
Stop reading CVE feeds looking for your own stack
Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.
Free plan, no card