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      "category" : "summary",
      "text" : "An update for dovecot is now available for Red Hat Enterprise Linux 10.\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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      "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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      "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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      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2452179"
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      "url" : "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_19149.json"
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    "title" : "Red Hat Security Advisory: dovecot security update",
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      "category" : "description",
      "text" : "A flaw was found in ManageSieve. A remote attacker can exploit this vulnerability by sending a crafted SASL (Simple Authentication and Security Layer) initial response during the AUTHENTICATE command. This can cause the ManageSieve service to crash repeatedly, leading to a Denial of Service (DoS) for other users.",
      "title" : "Vulnerability description"
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      "text" : "dovecot: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE command",
      "title" : "Vulnerability summary"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
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      "restart_required" : {
        "category" : "none"
      },
      "url" : "https://access.redhat.com/errata/RHSA-2026:19149"
    } ],
    "scores" : [ {
      "cvss_v3" : {
        "attackComplexity" : "LOW",
        "attackVector" : "NETWORK",
        "availabilityImpact" : "HIGH",
        "baseScore" : 7.5,
        "baseSeverity" : "HIGH",
        "confidentialityImpact" : "NONE",
        "integrityImpact" : "NONE",
        "privilegesRequired" : "NONE",
        "scope" : "UNCHANGED",
        "userInteraction" : "NONE",
        "vectorString" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version" : "3.1"
      },
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    } ],
    "threats" : [ {
      "category" : "impact",
      "details" : "Important"
    } ],
    "title" : "dovecot: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE command"
  }, {
    "cve" : "CVE-2026-27857",
    "cwe" : {
      "id" : "CWE-770",
      "name" : "Allocation of Resources Without Limits or Throttling"
    },
    "discovery_date" : "2026-03-27T09:01:59.374065+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2452179"
    } ],
    "notes" : [ {
      "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's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
    } ],
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    },
    "references" : [ {
      "category" : "self",
      "summary" : "Canonical URL",
      "url" : "https://access.redhat.com/security/cve/CVE-2026-27857"
    }, {
      "category" : "external",
      "summary" : "RHBZ#2452179",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2452179"
    }, {
      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-27857",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-27857"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-27857",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-27857"
    }, {
      "category" : "external",
      "summary" : "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json",
      "url" : "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json"
    } ],
    "release_date" : "2026-03-27T08:10:20.761000+00:00",
    "remediations" : [ {
      "category" : "vendor_fix",
      "date" : "2026-05-19T16:19:27+00:00",
      "details" : "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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        "category" : "none"
      },
      "url" : "https://access.redhat.com/errata/RHSA-2026:19149"
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      "category" : "workaround",
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    "scores" : [ {
      "cvss_v3" : {
        "attackComplexity" : "LOW",
        "attackVector" : "NETWORK",
        "availabilityImpact" : "HIGH",
        "baseScore" : 7.5,
        "baseSeverity" : "HIGH",
        "confidentialityImpact" : "NONE",
        "integrityImpact" : "NONE",
        "privilegesRequired" : "NONE",
        "scope" : "UNCHANGED",
        "userInteraction" : "NONE",
        "vectorString" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version" : "3.1"
      },
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    "threats" : [ {
      "category" : "impact",
      "details" : "Important"
    } ],
    "title" : "dovecot: denial of service via specially crafted NOOP command"
  }, {
    "cve" : "CVE-2026-27858",
    "cwe" : {
      "id" : "CWE-770",
      "name" : "Allocation of Resources Without Limits or Throttling"
    },
    "discovery_date" : "2026-03-27T09:01:45.192608+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2452175"
    } ],
    "notes" : [ {
      "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's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
    } ],
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    },
    "references" : [ {
      "category" : "self",
      "summary" : "Canonical URL",
      "url" : "https://access.redhat.com/security/cve/CVE-2026-27858"
    }, {
      "category" : "external",
      "summary" : "RHBZ#2452175",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2452175"
    }, {
      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-27858",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-27858"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-27858",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-27858"
    }, {
      "category" : "external",
      "summary" : "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json",
      "url" : "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json"
    } ],
    "release_date" : "2026-03-27T08:10:21.424000+00:00",
    "remediations" : [ {
      "category" : "vendor_fix",
      "date" : "2026-05-19T16:19:27+00:00",
      "details" : "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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        "category" : "none"
      },
      "url" : "https://access.redhat.com/errata/RHSA-2026:19149"
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    } ],
    "scores" : [ {
      "cvss_v3" : {
        "attackComplexity" : "LOW",
        "attackVector" : "NETWORK",
        "availabilityImpact" : "HIGH",
        "baseScore" : 7.5,
        "baseSeverity" : "HIGH",
        "confidentialityImpact" : "NONE",
        "integrityImpact" : "NONE",
        "privilegesRequired" : "NONE",
        "scope" : "UNCHANGED",
        "userInteraction" : "NONE",
        "vectorString" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version" : "3.1"
      },
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    } ],
    "threats" : [ {
      "category" : "impact",
      "details" : "Important"
    } ],
    "title" : "dovecot: denial of service via crafted message before authentication"
  } ]
}