| Name | CVE-2026-40947 |
| 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libfido2 (PTS) | bullseye | 1.6.0-2 | fixed |
| bookworm | 1.12.0-2 | fixed |
| trixie | 1.15.0-1 | fixed |
| forky | 1.16.0-2 | fixed |
| sid | 1.17.0-1 | fixed |
| python-fido2 (PTS) | bookworm, bullseye | 0.9.1-1 | fixed |
| trixie | 1.2.0-2 | fixed |
| forky | 2.0.0-1 | fixed |
| sid | 2.2.0-2 | fixed |
| yubikey-manager (PTS) | bullseye | 4.0.0~a1-4 | fixed |
| bookworm | 4.0.9-1 | fixed |
| trixie | 5.6.1+repack1-1 | fixed |
| forky | 5.8.0-4 | fixed |
| sid | 5.9.1-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| libfido2 | source | (unstable) | (not affected) | | | |
| python-fido2 | source | (unstable) | (not affected) | | | |
| yubikey-manager | source | (unstable) | (not affected) | | | |
Notes
- libfido2 <not-affected> (Only affects libfido2 on Windows)
- python-fido2 <not-affected> (Only affects python-fido2 on Windows)
- yubikey-manager <not-affected> (Only affects python-fido2 on Windows)
https://www.yubico.com/support/security-advisories/ysa-2026-01/