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    CVE-2026-42256

    Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. From versions 0.4.0 to before 0.4.24, 0.5.0 to before 0.5.14, and 0.6.0 to before 0.6.4, when authenticating a connection with SCRAM-SHA1 or SCRAM-SHA256, a hostile server can perform a computational denial-of-service attack on the client process by sending a big iteration count value. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.

    Published:May 9, 2026
    Last Modified:May 18, 2026
    EPS:May 9, 2026
    EPSS Score:0.00066
    CVSS Score:6.5

    Affected Products

    Vendor
    Ruby-lang
    Product
    Net::imap
    Vendor
    Ruby-lang
    Product
    Net\

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-47242 (CVSS 5.8) — Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and …
    CVE-2026-47240 (CVSS 5.8) — Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and …
    CVE-2026-47241 (CVSS 2.1) — Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and …
    CVE-2026-42258 (CVSS 5.8) — Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0…
    CVE-2026-42257 (CVSS 5.8) — Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0…
    CVE-2026-42245 (CVSS 2.3) — Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0…
    CVE-2026-42246 (CVSS 7.6) — Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0…

    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