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    2 vulnerabilities found for msquic by microsoft

    CVE-2026-105794 (GCVE-0-2026-105794)

    Vulnerability from nvd – Published: 2026-10-06 14:14 – Updated: 2026-10-06 17:40
    VLAI
    Title
    MsQuic: Improper Certificate Validation in Microsoft.Native.Quic.MsQuic.OpenSSL
    Summary
    MsQuic is a cross-platform C implementation of the IETF QUIC protocol exposed to C, C++, C#, and Rust. Prior to 2.4.20, 2.5.11, and 2.6.1, MsQuic clients using the OpenSSL or QuicTLS TLS backend do not properly verify that a server certificate matches the intended target server hostname. An on-path attacker can therefore present a certificate that does not match the intended target hostname and spoof the server in a man-in-the-middle attack. The Schannel backend is not affected. This issue is fixed in versions 2.4.20, 2.5.11, and 2.6.1.
    Severity
    9.1 (Critical)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-10-06 17:34 UTC
    CWE
    • CWE-295 - Improper Certificate Validation
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 7619 records in the last 180 days details
    References
    Impacted products
    Vendor Product Version
    microsoft msquic Affected: < 2.4.20
    Affected: >= 2.5.0, < 2.5.11
    Affected: >= 2.6.0, < 2.6.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-105794 (GCVE-0-2026-105794)

    Vulnerability from cvelistv5 – Published: 2026-10-06 14:14 – Updated: 2026-10-06 17:40
    VLAI
    Title
    MsQuic: Improper Certificate Validation in Microsoft.Native.Quic.MsQuic.OpenSSL
    Summary
    MsQuic is a cross-platform C implementation of the IETF QUIC protocol exposed to C, C++, C#, and Rust. Prior to 2.4.20, 2.5.11, and 2.6.1, MsQuic clients using the OpenSSL or QuicTLS TLS backend do not properly verify that a server certificate matches the intended target server hostname. An on-path attacker can therefore present a certificate that does not match the intended target hostname and spoof the server in a man-in-the-middle attack. The Schannel backend is not affected. This issue is fixed in versions 2.4.20, 2.5.11, and 2.6.1.
    Severity
    9.1 (Critical)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-10-06 17:34 UTC
    CWE
    • CWE-295 - Improper Certificate Validation
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 7619 records in the last 180 days details
    References
    Impacted products
    Vendor Product Version
    microsoft msquic Affected: < 2.4.20
    Affected: >= 2.5.0, < 2.5.11
    Affected: >= 2.6.0, < 2.6.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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