Bug 2468500 (CVE-2026-42256) - CVE-2026-42256 ruby/net-imap: ruby: Net::IMAP: Denial of Service via large iteration count in SCRAM authentication
Summary: CVE-2026-42256 ruby/net-imap: ruby: Net::IMAP: Denial of Service via large it...
Keywords:
Status: NEW
Alias: CVE-2026-42256
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-09 20:01 UTC by OSIDB Bzimport
Modified: 2026-08-05 16:40 UTC (History)
15 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:50728 0 None None None 2026-08-05 09:40:16 UTC
Red Hat Product Errata RHSA-2026:50773 0 None None None 2026-08-05 11:21:47 UTC
Red Hat Product Errata RHSA-2026:50778 0 None None None 2026-08-05 12:04:29 UTC
Red Hat Product Errata RHSA-2026:50827 0 None None None 2026-08-05 16:40:21 UTC
Red Hat Product Errata RHSA-2026:50828 0 None None None 2026-08-05 16:37:12 UTC

Description OSIDB Bzimport 2026-05-09 20:01:31 UTC 
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.
Comment 3 errata-xmlrpc 2026-08-05 09:40:15 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:50728 https://access.redhat.com/errata/RHSA-2026:50728
Comment 4 errata-xmlrpc 2026-08-05 11:21:44 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:50773 https://access.redhat.com/errata/RHSA-2026:50773
Comment 5 errata-xmlrpc 2026-08-05 12:04:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:50778 https://access.redhat.com/errata/RHSA-2026:50778
Comment 6 errata-xmlrpc 2026-08-05 16:37:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:50828 https://access.redhat.com/errata/RHSA-2026:50828
Comment 7 errata-xmlrpc 2026-08-05 16:40:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:50827 https://access.redhat.com/errata/RHSA-2026:50827
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