Vulnerability DatabaseCVE-2026-40947
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CVE-2026-40947
Published:April 15, 2026
Updated:May 18, 2026
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 Packages
fido2 (CONDA):
Affected version(s) >=0.7.1 <2.2.0
Fix Suggestion:
Update to version 2.2.0
https://github.com/Yubico/libfido2.git (GITHUB):
Affected version(s) >=1.0.0 <1.17.0
Fix Suggestion:
Update to version 1.17.0
https://github.com/Yubico/python-fido2.git (GITHUB):
Affected version(s) >=0.7.1 <2.2.0
Fix Suggestion:
Update to version 2.2.0
https://github.com/Yubico/yubikey-manager.git (GITHUB):
Affected version(s) >=yubikey-manager-TEST <5.9.1
Fix Suggestion:
Update to version 5.9.1
fido2 (PYTHON):
Affected version(s) >=0.7.1 <2.2.0
Fix Suggestion:
Update to version 2.2.0
yubikey-manager (PYTHON):
Affected version(s) >=0.1.0 <5.9.1
Fix Suggestion:
Update to version 5.9.1
Related Resources (1)
https://www.yubico.com/support/security-advisories/ysa-2026-01/
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CVSS v4
Base Score:
2.1
Attack Vector
LOCAL
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
2.9
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Untrusted Search Path
CWE-426
EPSS
Base Score:
0.01