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CVE-2026-40947

Quick assessment

Affected
Yubico libfido2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libfido2等都是Yubico开源的产品。libfido2是一个FIDO设备通信库。python-fido2是一个FIDO2协议客户端与服务器端实现库。yubikey-manager是一个YubiKey配置管理工具。 Yubico多款产品存在安全漏洞，该漏洞源于存在非预期的DLL搜索路径。以下产品及版本受到影响：libfido2 1.17.0之前版本、python-fido2 2.2.0之前版本和yubikey-manager 5.9.1之前版本。

CVSS 2.9 · Low EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1574.002
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I. Basic Information for CVE-2026-40947

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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 Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不可信的搜索路径
Source: CVE Program / CVE List V5
Vulnerability Title
Yubico多款产品 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libfido2等都是Yubico开源的产品。libfido2是一个FIDO设备通信库。python-fido2是一个FIDO2协议客户端与服务器端实现库。yubikey-manager是一个YubiKey配置管理工具。 Yubico多款产品存在安全漏洞，该漏洞源于存在非预期的DLL搜索路径。以下产品及版本受到影响：libfido2 1.17.0之前版本、python-fido2 2.2.0之前版本和yubikey-manager 5.9.1之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Yubico libfido2 0 ~ 1.17.0 -
Yubico python-fido2 0 ~ 2.2.0 -
Yubico yubikey-manager 0 ~ 5.9.1 -

II. Public POCs for CVE-2026-40947

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-40947

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Vendor Advisories for CVE-2026-40947 (1)

IV. Related Vulnerabilities

Same vendor: Yubico
Same weakness: CWE-426

V. Comments for CVE-2026-40947

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