{"id":"DEBIAN-CVE-2026-42256","details":"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.","modified":"2026-09-01T16:06:43.121254256Z","published":"2026-05-09T20:16:28.313Z","upstream":["CVE-2026-42256"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-42256"}],"affected":[{"package":{"name":"ruby3.1","ecosystem":"Debian:12","purl":"pkg:deb/debian/ruby3.1?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.2-7","3.1.2-7+deb12u1","3.1.2-7+hurd.1","3.1.2-8","3.1.2-8.1~exp1","3.1.2-8.3","3.1.2-8.4","3.1.2-8.5"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42256.json"}},{"package":{"name":"ruby3.3","ecosystem":"Debian:13","purl":"pkg:deb/debian/ruby3.3?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.8-2","3.3.8-2.1","3.3.8-2.2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42256.json"}},{"package":{"name":"ruby3.3","ecosystem":"Debian:14","purl":"pkg:deb/debian/ruby3.3?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.8-2","3.3.8-2.1","3.3.8-2.2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42256.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}