{"id":"DEBIAN-CVE-2026-125111","details":"Rack is a modular Ruby web server interface. Prior to 2.2.25, 3.1.23, and 3.2.8, Rack::Multipart::Parser can retain parsed data in its internal StringScanner buffer when reads end inside or immediately after multipart headers. An unauthenticated attacker can align many small parts with rack.multipart.buffer_size boundaries so the buffer grows with the request despite per-field, header, and preamble limits, causing a worker to exhaust memory. The attack requires only a well-formed multipart body and affects applications that parse multipart requests. This issue is fixed in versions 2.2.25, 3.1.23, and 3.2.8.","modified":"2026-11-10T13:00:06.236206953Z","published":"2026-11-09T22:18:42.433Z","upstream":["CVE-2026-125111"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-125111"}],"affected":[{"package":{"name":"ruby-rack","ecosystem":"Debian:12","purl":"pkg:deb/debian/ruby-rack?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.13-1~deb12u1","2.2.20-0+deb12u1","2.2.22-0+deb12u1","2.2.22-0+deb12u2","2.2.6.4-1","2.2.6.4-1+deb12u1","2.2.7-1","2.2.7-1.1","3.0.0-1","3.0.8-1","3.0.8-2","3.0.8-3","3.0.8-4","3.1.12-1","3.1.12-2~exp1","3.1.16-0.1","3.1.18-1","3.1.18-1~deb13u1","3.1.9-1~exp1","3.1.9-2","3.2.4-1","3.2.5-1","3.2.5-2","3.2.6-1","3.2.6-2","3.2.6-3","3.2.7-1","3.2.8-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-125111.json"}},{"package":{"name":"ruby-rack","ecosystem":"Debian:13","purl":"pkg:deb/debian/ruby-rack?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.16-0.1","3.1.18-1","3.1.18-1~deb13u1","3.1.20-0+deb13u1","3.1.20-0+deb13u2","3.2.4-1","3.2.5-1","3.2.5-2","3.2.6-1","3.2.6-2","3.2.6-3","3.2.7-1","3.2.8-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-125111.json"}},{"package":{"name":"ruby-rack","ecosystem":"Debian:14","purl":"pkg:deb/debian/ruby-rack?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.8-1"}]}],"versions":["3.1.16-0.1","3.1.18-1","3.1.18-1~deb13u1","3.2.4-1","3.2.5-1","3.2.5-2","3.2.6-1","3.2.6-2","3.2.6-3","3.2.7-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-125111.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}