CVE catalog

CVE-2026-40947

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.

[CVE catalog]

Severity: Low · CVSS 2.9CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Published: Apr 15, 2026, 10:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.13% · Oct 25, 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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	libfido2	sid	`1.17.0-2`	not affected
Debian	libfido2	forky	`1.17.0-2`	not affected
Debian	libfido2	trixie	`1.15.0-1`	not affected
Debian	libfido2	bookworm	`1.12.0-2`	not affected
Debian	python-fido2	sid	`2.2.1-2`	not affected
Debian	python-fido2	forky	`2.2.1-2`	not affected
Debian	python-fido2	trixie	`1.2.0-2`	not affected
Debian	python-fido2	bookworm	`0.9.1-1`	not affected
Debian	yubikey-manager	sid	`5.9.2-1`	not affected
Debian	yubikey-manager	forky	`5.9.2-1`	not affected
Debian	yubikey-manager	trixie	`5.6.1+repack1-1`	not affected
Debian	yubikey-manager	bookworm	`4.0.9-1`	not affected
Cpe	libfido2	Not reported	Not reported	not affected

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libfido2	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	libfido2	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	libfido2	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	libfido2	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Debian	python-fido2	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	python-fido2	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	python-fido2	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	python-fido2	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Debian	yubikey-manager	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	yubikey-manager	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	yubikey-manager	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	yubikey-manager	source	bookworm	`Not affected`	unimportant	Not reported	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[fido2-tools]Not affected
Source package: [libfido2]
Details (2)
- 1.12.0-2+b1 · amd64 · bookworm
  Not affected
  nvd · libfido2 · debian · bookworm
- 1.12.0-2+b1 · arm64 · bookworm
  Not affected
  nvd · libfido2 · debian · bookworm
[libfido2-1]Not affected
Source package: [libfido2]
Details (2)
- 1.12.0-2+b1 · amd64 · bookworm
  Not affected
  nvd · libfido2 · debian · bookworm
- 1.12.0-2+b1 · arm64 · bookworm
  Not affected
  nvd · libfido2 · debian · bookworm
[libfido2-dev]Not affected
Source package: [libfido2]
Details (2)
- 1.12.0-2+b1 · amd64 · bookworm
  Not affected
  nvd · libfido2 · debian · bookworm
- 1.12.0-2+b1 · arm64 · bookworm
  Not affected
  nvd · libfido2 · debian · bookworm
[libfido2-doc]Not affected
Source package: [libfido2]
Details (2)
- 1.12.0-2 · all · bookworm
  Not affected
  nvd · libfido2 · debian · bookworm
- 1.12.0-2 · all · bookworm
  Not affected
  nvd · libfido2 · debian · bookworm
[python3-fido2]Not affected
Source package: [python-fido2]
Details (2)
- 0.9.1-1 · all · bookworm
  Not affected
  nvd · python-fido2 · debian · bookworm
- 0.9.1-1 · all · bookworm
  Not affected
  nvd · python-fido2 · debian · bookworm
[python3-ykman]Not affected
Source package: [yubikey-manager]
Details (2)
- 4.0.9-1 · all · bookworm
  Not affected
  nvd · yubikey-manager · debian · bookworm
- 4.0.9-1 · all · bookworm
  Not affected
  nvd · yubikey-manager · debian · bookworm
[python3-yubikey-manager]Not affected
Source package: [yubikey-manager]
Details (2)
- 4.0.9-1 · all · bookworm
  Not affected
  nvd · yubikey-manager · debian · bookworm
- 4.0.9-1 · all · bookworm
  Not affected
  nvd · yubikey-manager · debian · bookworm
[yubikey-manager]Not affected
Details (2)
- 4.0.9-1 · all · bookworm
  Not affected
  nvd · yubikey-manager · debian · bookworm
- 4.0.9-1 · all · bookworm
  Not affected
  nvd · yubikey-manager · debian · bookworm

Observed: Oct 23, 2026, 10:32:49 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)]