Vulnerability · Published Apr 15, 2026 · Assigned by mitre
CVE-2026-40947
Low 2.9
In plain English
A low-severity security flaw in libfido2 from Yubico. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).
Severity (CVSS 3.1)2.9Low
Exploit odds (30 days)0.1%top 97.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Yubico | libfido2 | 0 – before 1.17.0 |
| Yubico | python-fido2 | 0 – before 2.2.0 |
| Yubico | yubikey-manager | 0 – before 5.9.1 |
Weakness: CWE-426 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N