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    "distribution": {
      "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
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      {
        "category": "summary",
        "text": "An update for dovecot is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
        "title": "Topic"
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      {
        "category": "general",
        "text": "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: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE command (CVE-2025-59032)\n\n* dovecot: denial of service via crafted message before authentication (CVE-2026-27858)\n\n* dovecot: denial of service via specially crafted NOOP command (CVE-2026-27857)\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.",
        "title": "Details"
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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
        "title": "Terms of Use"
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        "summary": "2452179",
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        "summary": "Canonical URL",
        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_18053.json"
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    "title": "Red Hat Security Advisory: dovecot security update",
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      "cve": "CVE-2026-27857",
      "cwe": {
        "id": "CWE-770",
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2452179"
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        {
          "category": "description",
          "text": "A flaw was found in dovecot. An unauthenticated and remote attacker can send a specially crafted \"NOOP\" command containing numerous open and close parentheses without a command-ending line feed, causing the server to allocate an excessive amount of memory, resulting in a denial of service.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "dovecot: denial of service via specially crafted NOOP command",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This flaw allows an unauthenticated and remote attacker to cause a denial of service via a specially crafted \"NOOP\" command. Due to this reason, this vulnerability has been rated with an important severity.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "url": "https://www.cve.org/CVERecord?id=CVE-2026-27857"
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          "category": "external",
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          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27857"
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          "category": "external",
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            "privilegesRequired": "NONE",
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      "cve": "CVE-2026-27858",
      "cwe": {
        "id": "CWE-770",
        "name": "Allocation of Resources Without Limits or Throttling"
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2452175"
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        {
          "category": "description",
          "text": "A flaw was found in dovecot. An unauthenticated and remote attacker can send a crafted message that causes managesieve to allocate an excessive amount of memory, forcing managesieve-login to be unavailable by repeatedly crashing the process, resulting in a denial of service.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "dovecot: denial of service via crafted message before authentication",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This flaw allows an unauthenticated and remote attacker to cause a denial of service via a specially crafted message. Due to this reason, this vulnerability has been rated with an important severity.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-27858",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27858"
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          "category": "external",
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