{"id":"DEBIAN-CVE-2026-42304","details":"Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.4.0rc2, the twisted.names module is vulnerable to a Denial of Service (DoS) attack via resource exhaustion during DNS name decompression. A remote, unauthenticated attacker can exploit this by sending a crafted TCP DNS packet containing deeply chained compression pointers. This flaw bypasses previous loop-prevention logic, causing the single-threaded Twisted reactor to hang while processing millions of recursive lookups, effectively freezing the server. This vulnerability is fixed in 26.4.0rc2.","modified":"2026-09-01T16:06:42.465239666Z","published":"2026-05-13T21:16:46.933Z","upstream":["CVE-2026-42304"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-42304"}],"affected":[{"package":{"name":"twisted","ecosystem":"Debian:12","purl":"pkg:deb/debian/twisted?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["22.4.0-4","22.4.0-4+deb12u1","23.10.0-1","23.10.0-2","24.10.0-1","24.10.0-2","24.11.0-1","24.3.0-1","24.3.0-2","24.3.0-3","24.7.0-1","24.7.0-2","24.7.0-3","25.5.0-1","25.5.0-2","25.5.0-3","25.5.0-4","25.5.0-5","26.4.0-1","26.4.0-2","26.4.0-3","26.4.0-4"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42304.json"}},{"package":{"name":"twisted","ecosystem":"Debian:13","purl":"pkg:deb/debian/twisted?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["24.11.0-1","25.5.0-1","25.5.0-2","25.5.0-3","25.5.0-4","25.5.0-5","26.4.0-1","26.4.0-2","26.4.0-3","26.4.0-4"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42304.json"}},{"package":{"name":"twisted","ecosystem":"Debian:14","purl":"pkg:deb/debian/twisted?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"26.4.0-1"}]}],"versions":["24.11.0-1","25.5.0-1","25.5.0-2","25.5.0-3","25.5.0-4","25.5.0-5"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42304.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}