{"id":"DEBIAN-CVE-2026-92543","details":"Docker Engine classifies a registry hostname as insecure using an any-match DNS check. loadInsecureRegistries() injects 127.0.0.0/8 and ::1/128 as insecure CIDRs by default. isCIDRMatch resolves all of the hostname's addresses and returns true if a single address is in the insecure CIDR list. Because the transport re-dials the hostname rather than the CIDR-matching address, a DNS answer set of one loopback IP plus a non-loopback attacker IP disables certificate verification and enables HTTP fallback for the registry connection.","modified":"2026-10-08T05:00:10.906360497Z","published":"2026-10-07T17:17:02.727Z","upstream":["CVE-2026-92543"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-92543"}],"affected":[{"package":{"name":"docker.io","ecosystem":"Debian:12","purl":"pkg:deb/debian/docker.io?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20.10.24+dfsg1-1","20.10.24+dfsg1-1+deb12u1","20.10.25+dfsg1-1","20.10.25+dfsg1-2","20.10.25+dfsg1-3","20.10.25+dfsg1-4","26.1.4+dfsg1-1","26.1.4+dfsg1-2","26.1.4+dfsg1-3","26.1.4+dfsg1-4","26.1.4+dfsg1-5","26.1.4+dfsg1-6","26.1.4+dfsg1-7","26.1.4+dfsg1-8","26.1.4+dfsg1-9","26.1.4+dfsg2-1","26.1.4+dfsg3-1","26.1.5+dfsg1-1","26.1.5+dfsg1-10","26.1.5+dfsg1-2","26.1.5+dfsg1-3","26.1.5+dfsg1-4","26.1.5+dfsg1-5","26.1.5+dfsg1-6","26.1.5+dfsg1-7","26.1.5+dfsg1-8","26.1.5+dfsg1-9","27.5.1+dfsg1-1","27.5.1+dfsg1-2","27.5.1+dfsg2-1","27.5.1+dfsg3-1","27.5.1+dfsg3-2","27.5.1+dfsg3-3","27.5.1+dfsg3-4","27.5.1+dfsg3-5","27.5.1+dfsg3-6","27.5.1+dfsg4-1","27.5.1+dfsg4-2","28.5.2+dfsg1-1","28.5.2+dfsg2-1","28.5.2+dfsg3-1","28.5.2+dfsg3-2","28.5.2+dfsg4-1","28.5.2+dfsg4-2","28.5.2+dfsg4-3","28.5.2+dfsg4-4","28.5.2+dfsg4-5"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-92543.json"}},{"package":{"name":"docker.io","ecosystem":"Debian:13","purl":"pkg:deb/debian/docker.io?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["26.1.5+dfsg1-10","26.1.5+dfsg1-9","26.1.5+dfsg1-9+deb13u1","27.5.1+dfsg1-1","27.5.1+dfsg1-2","27.5.1+dfsg2-1","27.5.1+dfsg3-1","27.5.1+dfsg3-2","27.5.1+dfsg3-3","27.5.1+dfsg3-4","27.5.1+dfsg3-5","27.5.1+dfsg3-6","27.5.1+dfsg4-1","27.5.1+dfsg4-2","28.5.2+dfsg1-1","28.5.2+dfsg2-1","28.5.2+dfsg3-1","28.5.2+dfsg3-2","28.5.2+dfsg4-1","28.5.2+dfsg4-2","28.5.2+dfsg4-3","28.5.2+dfsg4-4","28.5.2+dfsg4-5"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-92543.json"}},{"package":{"name":"docker.io","ecosystem":"Debian:14","purl":"pkg:deb/debian/docker.io?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["26.1.5+dfsg1-10","26.1.5+dfsg1-9","27.5.1+dfsg1-1","27.5.1+dfsg1-2","27.5.1+dfsg2-1","27.5.1+dfsg3-1","27.5.1+dfsg3-2","27.5.1+dfsg3-3","27.5.1+dfsg3-4","27.5.1+dfsg3-5","27.5.1+dfsg3-6","27.5.1+dfsg4-1","27.5.1+dfsg4-2","28.5.2+dfsg1-1","28.5.2+dfsg2-1","28.5.2+dfsg3-1","28.5.2+dfsg3-2","28.5.2+dfsg4-1","28.5.2+dfsg4-2","28.5.2+dfsg4-3","28.5.2+dfsg4-4","28.5.2+dfsg4-5"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-92543.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}