CVE-2026-42245

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, Net::IMAP::ResponseReader has quadratic time complexity when reading large responses containing many string literals. A hostile server can send responses which are crafted to exhaust the client's CPU for a denial of service attack. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.

• CWE-407

• https://github.com/ruby/net-imap/commit/6091f7d6b1f3514cafbfe39c76f2b5d73de3ca96Patch
• https://github.com/ruby/net-imap/commit/88d95231fc8afef11c1f074453f7d75b68c9dfdaPatch
• https://github.com/ruby/net-imap/commit/de685f91a4a4cc75eb80da898c2bf8af08d34819Patch
• https://github.com/ruby/net-imap/releases/tag/v0.4.24Release Notes
• https://github.com/ruby/net-imap/releases/tag/v0.5.14Release Notes
• https://github.com/ruby/net-imap/releases/tag/v0.6.4Release Notes
• https://github.com/ruby/net-imap/security/advisories/GHSA-q2mw-fvj9-vvcwMitigation, Vendor Advisory

Published

May 9, 2026

Last Modified

Jul 24, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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