{
  "cveId": "CVE-2026-27852",
  "url": "https://patchblox.com/security/cve/CVE-2026-27852",
  "summary": "CVE-2026-27852 is fixed in 12 products on 1 platform, first by RHSA-2026:79371, released August 28, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "dovecot: Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind",
  "description": "Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL drivers and authentication plug-ins are provided as subpackages. \n\nSecurity Fix(es):\n\n* dovecot: Dovecot: Denial of Service via IMAP ID command with excessive parameters (CVE-2026-42391)\n\n* dovecot: Dovecot: Authentication bypass via incorrect OAuth2 token validation (CVE-2026-73208)\n\n* dovecot: Dovecot: Denial of service via crafted email headers (CVE-2026-27852)\n\n* dovecot: Dovecot: Denial of Service via truncated quoted argument in ManageSieve (CVE-2026-40019)\n\n* dovecot: Dovecot: Denial of Service and potential message duplication via connection limit exhaustion (CVE-2026-33263)\n\n* dovecot: Dovecot: Denial of Service in ManageSieve login process (CVE-2026-33605)\n\n* dovecot: Dovecot: Arbitrary Code Execution via Sieve editheader use-after-free (CVE-2026-42007)\n\n* dovecot: Dovecot: MySQL multi-byte escaping wrong (CVE-2026-40018)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
  "published": "2026-08-28T10:12:11Z",
  "severity": "Important",
  "cvss": 9.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H",
  "epss": 0.0043,
  "epssPercentile": 0.3747,
  "priority": "High",
  "priorityTier": 3,
  "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-2026-27852",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-27852",
      "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-2026-27852",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-27852",
      "released": "2026-09-10T12:12:19Z"
    },
    {
      "platform": "linux",
      "product": "dovecot",
      "release": "Debian 14",
      "fixedVersion": "1:2.4.5\u002Bdfsg1-1",
      "fix": "DEBIAN-CVE-2026-27852",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-27852",
      "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",
      "release": "RHEL 10",
      "fixedVersion": "2.3.21-19.el10_2.8",
      "fix": "RHSA-2026:79371",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-79371",
      "released": "2026-08-28T10:12:32Z"
    },
    {
      "platform": "linux",
      "product": "dovecot",
      "release": "RHEL 8",
      "fixedVersion": "1:2.3.16-16.el8_10",
      "fix": "RHSA-2026:76763",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-76763",
      "released": "2026-10-06T21:56:59Z"
    },
    {
      "platform": "linux",
      "product": "dovecot",
      "release": "RHEL 9",
      "fixedVersion": "1:2.3.16-18.el9_8.8",
      "fix": "RHSA-2026:80825",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-80825",
      "released": "2026-10-13T23:30:48Z"
    },
    {
      "platform": "linux",
      "product": "dovecot",
      "release": "almalinux 10",
      "fixedVersion": "1:2.3.21-19.el10_2.8",
      "fix": "ALSA-2026:79371",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-79371",
      "released": "2026-10-08T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dovecot",
      "release": "almalinux 8",
      "fixedVersion": "1:2.3.16-16.el8_10",
      "fix": "ALSA-2026:76763",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-76763",
      "released": "2026-10-06T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dovecot",
      "release": "almalinux 9",
      "fixedVersion": "1:2.3.16-18.el9_8.8",
      "fix": "ALSA-2026:80825",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-80825",
      "released": "2026-11-07T00:40:32Z"
    },
    {
      "platform": "linux",
      "product": "dovecot",
      "release": "amzn 2023",
      "fixedVersion": "1:2.3.20-1.amzn2023.0.4",
      "fix": "ALAS2023-2026-3109",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3109",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dovecot",
      "release": "ol 10",
      "fixedVersion": "1:2.3.21-19.el10_2.8",
      "fix": "ELSA-2026-79371",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-79371",
      "released": "2026-10-08T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dovecot",
      "release": "ol 8",
      "fixedVersion": "1:2.3.16-16.el8_10",
      "fix": "ELSA-2026-76763",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-76763",
      "released": "2026-10-06T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dovecot",
      "release": "ol 9",
      "fixedVersion": "1:2.3.16-18.el9_8.8",
      "fix": "ELSA-2026-80825",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-80825",
      "released": "2026-11-07T00:52:27Z"
    },
    {
      "platform": "linux",
      "product": "dovecot",
      "release": "rocky 10",
      "fixedVersion": "1:2.3.21-19.el10_2.8",
      "fix": "RLSA-2026:79371",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-79371",
      "released": "2026-11-07T00:39:51Z"
    },
    {
      "platform": "linux",
      "product": "dovecot",
      "release": "rocky 8",
      "fixedVersion": "1:2.3.16-16.el8_10",
      "fix": "RLSA-2026:76763",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-76763",
      "released": "2026-10-07T06:01:37Z"
    },
    {
      "platform": "linux",
      "product": "dovecot",
      "release": "rocky 9",
      "fixedVersion": "1:2.3.16-18.el9_8.8",
      "fix": "RLSA-2026:80825",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-80825",
      "released": "2026-11-07T00:39:57Z"
    },
    {
      "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-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:2.3.20-1.amzn2023.0.4",
      "fix": "ALAS2023-2026-3109",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3109",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "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-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "1:2.3.20-1.amzn2023.0.4",
      "fix": "ALAS2023-2026-3109",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3109",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "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",
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      "release": "RHEL 8",
      "fixedVersion": "1:2.3.16-16.el8_10",
      "fix": "RHSA-2026:76763",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-76763",
      "released": "2026-10-06T21:56:59Z"
    },
    {
      "platform": "linux",
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      "released": "2026-10-13T23:30:48Z"
    },
    {
      "platform": "linux",
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    {
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      "fix": "ALSA-2026:76763",
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    },
    {
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      "fix": "RHSA-2026:76763",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-76763",
      "released": "2026-10-06T21:56:59Z"
    },
    {
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      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-80825",
      "released": "2026-10-13T23:30:48Z"
    },
    {
      "platform": "linux",
      "product": "dovecot-mysql",
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      "fixedVersion": "1:2.3.21-19.el10_2.8",
      "fix": "ALSA-2026:79371",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-79371",
      "released": "2026-10-08T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dovecot-mysql",
      "release": "almalinux 8",
      "fixedVersion": "1:2.3.16-16.el8_10",
      "fix": "ALSA-2026:76763",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-76763",
      "released": "2026-10-06T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dovecot-mysql",
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      "fix": "ALSA-2026:80825",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-80825",
      "released": "2026-11-07T00:40:32Z"
    },
    {
      "platform": "linux",
      "product": "dovecot-mysql",
      "release": "amzn 2023",
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      "fix": "ALAS2023-2026-3109",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3109",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dovecot-mysql",
      "release": "ol 10",
      "fixedVersion": "1:2.3.21-19.el10_2.8",
      "fix": "ELSA-2026-79371",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-79371",
      "released": "2026-10-08T00:00:00Z"
    },
    {
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      "product": "dovecot-mysql",
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      "fix": "ELSA-2026-76763",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-76763",
      "released": "2026-10-06T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dovecot-mysql",
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      "fix": "ELSA-2026-80825",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-80825",
      "released": "2026-11-07T00:52:27Z"
    },
    {
      "platform": "linux",
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      "url": "https://patchblox.com/security/fix/linux/fedora-2026-e8a6485109",
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    },
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      "fix": "ALAS2023-2026-3109",
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      "released": "2026-09-28T09:00:00Z"
    },
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      "fix": "FEDORA-2026-E8A6485109",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-e8a6485109",
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      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-76763",
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    },
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    },
    {
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      "fix": "ALSA-2026:79371",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-79371",
      "released": "2026-10-08T00:00:00Z"
    },
    {
      "platform": "linux",
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      "fixedVersion": "1:2.3.16-16.el8_10",
      "fix": "ALSA-2026:76763",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-76763",
      "released": "2026-10-06T00:00:00Z"
    },
    {
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      "product": "dovecot-pgsql",
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      "fixedVersion": "1:2.3.16-18.el9_8.8",
      "fix": "ALSA-2026:80825",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-80825",
      "released": "2026-11-07T00:40:32Z"
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    {
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      "product": "dovecot-pgsql",
      "release": "amzn 2023",
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      "fix": "ALAS2023-2026-3109",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3109",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dovecot-pgsql",
      "release": "ol 10",
      "fixedVersion": "1:2.3.21-19.el10_2.8",
      "fix": "ELSA-2026-79371",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-79371",
      "released": "2026-10-08T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dovecot-pgsql",
      "release": "ol 8",
      "fixedVersion": "1:2.3.16-16.el8_10",
      "fix": "ELSA-2026-76763",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-76763",
      "released": "2026-10-06T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dovecot-pgsql",
      "release": "ol 9",
      "fixedVersion": "1:2.3.16-18.el9_8.8",
      "fix": "ELSA-2026-80825",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-80825",
      "released": "2026-11-07T00:52:27Z"
    },
    {
      "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",
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    },
    {
      "platform": "linux",
      "product": "dovecot-pgsql-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:2.3.20-1.amzn2023.0.4",
      "fix": "ALAS2023-2026-3109",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3109",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
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      "url": "https://patchblox.com/security/fix/linux/fedora-2026-e8a6485109",
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    },
    {
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      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-76763",
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    },
    {
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    {
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    {
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    {
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    },
    {
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    },
    {
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    },
    {
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      "released": "2026-10-06T00:00:00Z"
    },
    {
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      "url": "https://patchblox.com/security/fix/linux/elsa-2026-80825",
      "released": "2026-11-07T00:52:27Z"
    },
    {
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      "url": "https://patchblox.com/security/fix/linux/fedora-2026-e8a6485109",
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    },
    {
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      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3109",
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    },
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      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4139-1",
      "released": "2026-09-14T07:22:32Z"
    },
    {
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      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4139-1",
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    },
    {
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      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21720-1",
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    },
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      "released": "2026-09-01T14:12:16Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}