{ "cveId": "CVE-2026-40203", "url": "https://patchblox.com/security/cve/CVE-2026-40203", "summary": "CVE-2026-40203 is fixed in 12 products on 1 platform, first by SUSE-SU-2026:23595-1, released September 1, 2026. It is not reported as exploited. Patch Radar priority: Routine.", "title": "dovecot: When IMAP compression is enabled, the same compression state is reused across responses in a session, so response siz...", "description": "When IMAP compression is enabled, the same compression state is reused across responses in a session, so response sizes depend on both attacker-supplied mail and other mail in the same mailbox. An attacker that can send mail to a user and can also observe the sizes of that user\u0027s IMAP traffic can confirm whether the body of a small message matches a guessed text. Recovery of arbitrary unknown content was not demonstrated, but the attack can disclose whether a secret-like message body matches a candidate. Disable IMAP compression. Update to non-vulnerable version. No publicly available exploits are known.", "published": "2026-08-28T12:16:28Z", "severity": "low", "cvss": 3.7, "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "epss": 0.00257, "epssPercentile": 0.17483, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "fixes": [ { "platform": "linux", "product": "dovecot", "release": "Debian 12.15 (bookworm)", "fixedVersion": "1:2.3.19.1\u002Bdfsg1-2.1\u002Bdeb12u7", "fix": "DEBIAN-CVE-2026-40203", "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-40203", "released": "2026-09-10T12:12:19Z" }, { "platform": "linux", "product": "dovecot", "release": "Debian 13.5 (trixie)", "fixedVersion": "1:2.4.1\u002Bdfsg1-6\u002Bdeb13u7", "fix": "DEBIAN-CVE-2026-40203", "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-40203", "released": "2026-09-10T12:12:19Z" }, { "platform": "linux", "product": "dovecot", "release": "Debian 14", "fixedVersion": "1:2.4.5\u002Bdfsg1-1", "fix": "DEBIAN-CVE-2026-40203", "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-40203", "released": "2026-09-10T12:12:19Z" }, { "platform": "linux", "product": "dovecot", "release": "Fedora 43", "fixedVersion": "1:2.4.5-1.fc43", "fix": "FEDORA-2026-E8A6485109", "url": "https://patchblox.com/security/fix/linux/fedora-2026-e8a6485109", "released": "2026-09-10T05:35:17Z" }, { "platform": "linux", "product": "dovecot-debuginfo", "release": "Fedora 43", "fixedVersion": "1:2.4.5-1.fc43", "fix": "FEDORA-2026-E8A6485109", "url": "https://patchblox.com/security/fix/linux/fedora-2026-e8a6485109", "released": "2026-09-10T05:35:17Z" }, { "platform": "linux", "product": "dovecot-debugsource", "release": "Fedora 43", "fixedVersion": "1:2.4.5-1.fc43", "fix": "FEDORA-2026-E8A6485109", "url": "https://patchblox.com/security/fix/linux/fedora-2026-e8a6485109", "released": "2026-09-10T05:35:17Z" }, { "platform": "linux", "product": "dovecot-devel", "release": "Fedora 43", "fixedVersion": "1:2.4.5-1.fc43", "fix": "FEDORA-2026-E8A6485109", "url": "https://patchblox.com/security/fix/linux/fedora-2026-e8a6485109", "released": "2026-09-10T05:35:17Z" }, { "platform": "linux", "product": "dovecot-mysql", "release": "Fedora 43", "fixedVersion": "1:2.4.5-1.fc43", "fix": "FEDORA-2026-E8A6485109", "url": "https://patchblox.com/security/fix/linux/fedora-2026-e8a6485109", "released": "2026-09-10T05:35:17Z" }, { "platform": "linux", "product": "dovecot-mysql-debuginfo", "release": "Fedora 43", "fixedVersion": "1:2.4.5-1.fc43", "fix": "FEDORA-2026-E8A6485109", "url": "https://patchblox.com/security/fix/linux/fedora-2026-e8a6485109", "released": "2026-09-10T05:35:17Z" }, { "platform": "linux", "product": "dovecot-pgsql", "release": "Fedora 43", "fixedVersion": "1:2.4.5-1.fc43", "fix": "FEDORA-2026-E8A6485109", "url": "https://patchblox.com/security/fix/linux/fedora-2026-e8a6485109", "released": "2026-09-10T05:35:17Z" }, { "platform": "linux", "product": "dovecot-pgsql-debuginfo", "release": "Fedora 43", "fixedVersion": "1:2.4.5-1.fc43", "fix": "FEDORA-2026-E8A6485109", "url": "https://patchblox.com/security/fix/linux/fedora-2026-e8a6485109", "released": "2026-09-10T05:35:17Z" }, { "platform": "linux", "product": "dovecot-pigeonhole", "release": "Fedora 43", "fixedVersion": "1:2.4.5-1.fc43", "fix": "FEDORA-2026-E8A6485109", "url": "https://patchblox.com/security/fix/linux/fedora-2026-e8a6485109", "released": "2026-09-10T05:35:17Z" }, { "platform": "linux", "product": "dovecot-pigeonhole-debuginfo", "release": "Fedora 43", "fixedVersion": "1:2.4.5-1.fc43", "fix": "FEDORA-2026-E8A6485109", "url": "https://patchblox.com/security/fix/linux/fedora-2026-e8a6485109", "released": "2026-09-10T05:35:17Z" }, { "platform": "linux", "product": "dovecot23", "release": "sles 15.6", "fixedVersion": "2.3.21.1-150200.76.1", "fix": "SUSE-SU-2026:4139-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4139-1", "released": "2026-09-14T07:22:32Z" }, { "platform": "linux", "product": "dovecot23", "release": "sles 15.7", "fixedVersion": "2.3.21.1-150200.76.1", "fix": "SUSE-SU-2026:4139-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4139-1", "released": "2026-09-14T07:22:32Z" }, { "platform": "linux", "product": "dovecot24", "release": "opensuse-leap 16.0", "fixedVersion": "2.4.4-160000.2.1", "fix": "OPENSUSE-SU-2026:21720-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21720-1", "released": "2026-09-01T14:18:02Z" }, { "platform": "linux", "product": "dovecot24", "release": "sles 16.0", "fixedVersion": "2.4.4-160000.2.1", "fix": "SUSE-SU-2026:23595-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23595-1", "released": "2026-09-01T14:12:16Z" } ], "noFixYet": [], "dataAsOf": "2026-11-08T13:06:02Z", "attribution": { "text": "Data: Patchblox Patch Radar", "url": "https://patchblox.com/security/patch-radar", "terms": "https://patchblox.com/security/patch-radar/use-the-data" } }