CVE-2026-42256

MEDIUM

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.

CVSS v3.1 Score

6.5
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Published: 5/9/2026Modified: 7/24/2026

Related Intelligence (1)

CRITICALAi

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Rapid7

References (7)

https://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612Patchhttps://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4Patchhttps://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758Patchhttps://github.com/ruby/net-imap/releases/tag/v0.4.24Release Noteshttps://github.com/ruby/net-imap/releases/tag/v0.5.14Release Noteshttps://github.com/ruby/net-imap/releases/tag/v0.6.4Release Noteshttps://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7MitigationVendor Advisory