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Vulnerabilities

Vulnerability · 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.

Published Apr 16, 2026 · catalog updated Jun 17, 2026 · Yubico libfido2 before 1.17.0,

Check if you run it

No confirmed exploitation is on record for CVE-2026-40947. EPSS is 0.13%. Act only if a listed version of Yubico libfido2 before 1.17.0, is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Yubico libfido2 before 1.17.0,).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Low2.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.13%
Remediation
Advisory link
Affected products
See sources for product scope

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.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-40947

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-40947. EPSS is 0.13%. Act only if a listed version of Yubico libfido2 before 1.17.0, is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-426: Untrusted Search Path. EPSS 0.13%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 16, 2026 · NIST NVD

    Detected

    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.

  2. Jun 17, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-40947

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-40947

    30-day exploitation probability 0.1%

    first.org
  • NIST NVDVulnerability recordCVE-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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.