CVE-2026-40947

LOWNVD 2.92.9—

2.9

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.

CVSS v3: 2.9
EG Score: 2.9(medium)
EPSS: 0.3%
KEV: Not listed

Published

April 16, 2026

Last Modified

April 17, 2026

References (1)

cve@mitrehttps://www.yubico.com/support/security-advisories/ysa-2026-01/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-426Untrusted Search Path

Data Freshness Timeline

(refreshed 13× in last 7d / 17× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-20 17:03 UTCEG score recompute
2026-05-20 17:03 UTCGHSA enrichment
2026-05-20 11:22 UTCepss_batch
2026-05-20 11:22 UTCepss_batch

Frequently asked(5)

What is CVE-2026-40947?

CVE-2026-40947 is a low vulnerability published on April 16, 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.

When was CVE-2026-40947 disclosed?

CVE-2026-40947 was first published in the National Vulnerability Database on April 16, 2026, with the most recent update on April 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-40947 actively exploited?

CVE-2026-40947 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-40947?

CVE-2026-40947 has a CVSS v3 base score of 2.9 (NVD).

How do I remediate CVE-2026-40947?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40947, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-40947

📅 Published

🔄 Last Modified

🔗 References (1)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-40947?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (1)

Frequently asked(5)

Related CVEs(same CWE)