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    CVE-2026-88648

    Incomplete X.509 implementation in GnuTLS v3.8.13 allows attackers controlling a subordinate Certificate Authority to bypass cross-domain PKI restrictions and issue unauthorized certificates.

    Published:Oct 8, 2026
    Last Modified:Oct 19, 2026
    EPS:Oct 8, 2026
    EPSS Score:0.00117
    CVSS Score:3.7

    Affected Products

    Vendor
    Gnu
    Product
    Gnutls

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-295 Improper Certificate Validation

    Related CVEs

    CVE-2026-88647 (CVSS 6.5) — A hostname verification bypass in GnuTLS v3.8.13 allows attackers to circumvent the Common Name fallback mecha…
    CVE-2026-95184 (CVSS 5.9) — Improper certificate validation in gnutls v3.8.13 causes the application to reject legitimate certificates for…
    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-2026-95210 (CVSS 4.8) — Improper certificate validation in gnutls v3.8.13 causes the application to accept certificates containing inv…
    CVE-2026-67693 (CVSS 3.7) — An issue in gnutls v.3.8.13 allows an attacker to obtain sensitive information via failing to reject end-entit…
    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…
    CVE-2026-5260 (CVSS 8.2) — A flaw was found in libgnutls. A remote attacker, by sending an extremely short premaster secret during an RSA…

    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