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    CVE-2026-67693

    An issue in gnutls v.3.8.13 allows an attacker to obtain sensitive information via failing to reject end-entity X.509 certificates that contain a contradictory combination of Key Usage (KU) and Extended Key Usage (EKU)

    Published:Oct 8, 2026
    Last Modified:Oct 19, 2026
    EPS:Oct 8, 2026
    EPSS Score:0.00198
    CVSS Score:3.7

    Affected Products

    Vendor
    Gnu
    Product
    Gnutls

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-95209 (CVSS 5.9) — An issue in gnutls v3.8.13 causes legitimate CA certificates to be rejected, leading to a Denial of Service (D…
    CVE-2026-88648 (CVSS 3.7) — Incomplete X.509 implementation in GnuTLS v3.8.13 allows attackers controlling a subordinate Certificate Autho…
    CVE-2026-95210 (CVSS 4.8) — Improper certificate validation in gnutls v3.8.13 causes the application to accept certificates containing inv…
    CVE-2026-42014 (CVSS 6.6) — A flaw was found in GnuTLS. The `gnutls_pkcs11_token_set_pin` function, used for changing the Security Officer…
    CVE-2026-5419 (CVSS 3.7) — A flaw was found in gnutls. The PKCS#7 padding check, performed during decryption, was not constant-time. This…
    CVE-2026-42013 (CVSS 8.2) — A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could ca…
    CVE-2026-42012 (CVSS 7.1) — A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially craft…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High