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    CVE-2026-105221

    The gist RubyGem before 6.1.0 contains an improper certificate validation vulnerability that allows on-path attackers to intercept HTTPS traffic because http_connection in lib/gist.rb sets VERIFY_NONE. Attackers can present any certificate to read or modify GitHub API traffic, stealing OAuth tokens and login credentials to read and modify the victim's gists.

    Published:Oct 4, 2026
    Last Modified:Oct 6, 2026
    EPS:Oct 4, 2026
    EPSS Score:0.00178
    CVSS Score:7.4

    Affected Products

    Vendor
    Defunkt
    Product
    Gist

    Exploits

    https://github.com/abraxas/cve-2026-105221-gist-tls

    Common Weakness Enumeration

    CWE-295 Improper Certificate Validation

    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