{"id":"DEBIAN-CVE-2026-42008","details":"Forwarding information received from a host listed as a trusted proxy is not kept separate from Dovecot's own authentication fields, so a value sent by that host can be injected as an internal authentication field. Any host permitted to act as a trusted proxy can authenticate as any user without knowing that user's password. This affects deployments whose password database honours a field that permits authentication without a password. Deployments that do not configure trusted proxies are not affected. Restrict the list of trusted proxy networks to hosts that are fully under your control. Update to non-vulnerable version. No publicly available exploits are known.","modified":"2026-09-14T17:03:36.241357339Z","published":"2026-08-28T12:16:29.380Z","upstream":["CVE-2026-42008"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-42008"}],"affected":[{"package":{"name":"dovecot","ecosystem":"Debian:12","purl":"pkg:deb/debian/dovecot?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:2.3.19.1+dfsg1-2.1","1:2.3.19.1+dfsg1-2.1+deb12u1","1:2.3.19.1+dfsg1-2.1+deb12u2","1:2.3.19.1+dfsg1-2.1+deb12u3","1:2.3.19.1+dfsg1-2.1+deb12u4","1:2.3.19.1+dfsg1-2.1+deb12u5","1:2.3.19.1+dfsg1-2.1+deb12u6","1:2.3.20+dfsg1-1","1:2.3.21+dfsg1-1","1:2.3.21+dfsg1-2","1:2.3.21+dfsg1-3","1:2.3.21+dfsg1-3~bpo12+1","1:2.3.21.1+dfsg1-1","1:2.3.21.1+dfsg1-1~bpo12+1","1:2.4.0+dfsg1-1~exp1","1:2.4.0+dfsg1-1~exp2","1:2.4.0+dfsg1-1~exp3","1:2.4.0+dfsg1-1~exp4","1:2.4.0+dfsg1-1~exp5","1:2.4.0+dfsg1-1~exp6","1:2.4.1+dfsg1-1","1:2.4.1+dfsg1-1~exp1","1:2.4.1+dfsg1-1~exp2","1:2.4.1+dfsg1-2","1:2.4.1+dfsg1-3","1:2.4.1+dfsg1-4","1:2.4.1+dfsg1-5","1:2.4.1+dfsg1-6","1:2.4.1+dfsg1-6~exp1","1:2.4.1+dfsg1-7","1:2.4.1+dfsg1-8","1:2.4.1+dfsg1-9","1:2.4.2+dfsg1-1","1:2.4.2+dfsg1-2","1:2.4.2+dfsg1-3","1:2.4.2+dfsg1-4","1:2.4.3+dfsg1-1","1:2.4.3+dfsg1-2","1:2.4.4+dfsg1-1","1:2.4.4+dfsg1-2","1:2.4.5+dfsg1-1","1:2.4.5+dfsg1-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42008.json"}},{"package":{"name":"dovecot","ecosystem":"Debian:13","purl":"pkg:deb/debian/dovecot?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:2.4.1+dfsg1-6","1:2.4.1+dfsg1-6+deb13u1","1:2.4.1+dfsg1-6+deb13u2","1:2.4.1+dfsg1-6+deb13u3","1:2.4.1+dfsg1-6+deb13u4","1:2.4.1+dfsg1-6+deb13u5","1:2.4.1+dfsg1-6+deb13u6","1:2.4.1+dfsg1-7","1:2.4.1+dfsg1-8","1:2.4.1+dfsg1-9","1:2.4.2+dfsg1-1","1:2.4.2+dfsg1-2","1:2.4.2+dfsg1-3","1:2.4.2+dfsg1-4","1:2.4.3+dfsg1-1","1:2.4.3+dfsg1-2","1:2.4.4+dfsg1-1","1:2.4.4+dfsg1-2","1:2.4.5+dfsg1-1","1:2.4.5+dfsg1-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42008.json"}},{"package":{"name":"dovecot","ecosystem":"Debian:14","purl":"pkg:deb/debian/dovecot?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.4.5+dfsg1-1"}]}],"versions":["1:2.4.1+dfsg1-6","1:2.4.1+dfsg1-7","1:2.4.1+dfsg1-8","1:2.4.1+dfsg1-9","1:2.4.2+dfsg1-1","1:2.4.2+dfsg1-2","1:2.4.2+dfsg1-3","1:2.4.2+dfsg1-4","1:2.4.3+dfsg1-1","1:2.4.3+dfsg1-2","1:2.4.4+dfsg1-1","1:2.4.4+dfsg1-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42008.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"}]}