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      "category" : "summary",
      "text" : "An update for python-idna is now available for Red Hat Enterprise Linux 10.\n\nRed Hat Product Security has rated this update as having a security impact of Moderate. 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" : "Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.\n\nSecurity Fix(es):\n\n* python-idna: idna: Denial of Service via specially crafted long inputs (CVE-2026-45409)\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.",
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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.",
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    "title" : "Red Hat Security Advisory: python-idna security update",
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      "name" : "Allocation of Resources Without Limits or Throttling"
    },
    "discovery_date" : "2026-06-05T23:01:44.292958+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2485616"
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    "notes" : [ {
      "category" : "description",
      "text" : "A flaw was found in the idna library, which handles Internationalized Domain Names in Python applications. A remote attacker could exploit this vulnerability by sending specially crafted, excessively long inputs to the library's encoding function. This could cause the system to consume significant resources, leading to a Denial of Service (DoS), where the affected application becomes unavailable to legitimate users. This issue stems from an incomplete fix for a previously identified vulnerability.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "python-idna: idna: Denial of Service via specially crafted long inputs",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "A flaw was found in the python-idna library. This is an incomplete fix for CVE-2024-3651. The idna.encode() function performs contextual validation checks (valid_contexto) before rejecting oversized inputs, allowing specially crafted long payloads to cause excessive CPU consumption and lead to a denial of service. The fix in version 3.14 rejects long inputs early before further processing, and version 3.15 extends this approach to alternate per-label conversion and codec functions.",
      "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"
    } ],
    "product_status" : {
      "fixed" : [ "BaseOS-10.2.Z:python-idna-0:3.7-6.el10_2.src", "BaseOS-10.2.Z:python3-idna-0:3.7-6.el10_2.noarch" ]
    },
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      "url" : "https://access.redhat.com/security/cve/CVE-2026-45409"
    }, {
      "category" : "external",
      "summary" : "RHBZ#2485616",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2485616"
    }, {
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      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-45409",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-45409"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-45409",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-45409"
    }, {
      "category" : "external",
      "summary" : "https://github.com/kjd/idna/security/advisories/GHSA-65pc-fj4g-8rjx",
      "url" : "https://github.com/kjd/idna/security/advisories/GHSA-65pc-fj4g-8rjx"
    } ],
    "release_date" : "2026-06-05T22:06:07.082000+00:00",
    "remediations" : [ {
      "category" : "vendor_fix",
      "date" : "2026-08-13T07:52:40+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",
      "product_ids" : [ "BaseOS-10.2.Z:python-idna-0:3.7-6.el10_2.src", "BaseOS-10.2.Z:python3-idna-0:3.7-6.el10_2.noarch" ],
      "restart_required" : {
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      "url" : "https://access.redhat.com/errata/RHSA-2026:54481"
    }, {
      "category" : "workaround",
      "details" : "To mitigate this denial-of-service vulnerability, applications utilizing the `idna` Python library should implement input validation to ensure that domain names do not exceed the standard 253-character length limit before being passed to the `idna.encode()` function. This operational control prevents the processing of excessively long inputs that could lead to resource exhaustion and service unavailability.\n\nApplications that pass user-controlled data directly to `idna.encode()` without validation checks (e.g.: DNS length < 254 chars) are affected.",
      "product_ids" : [ "BaseOS-10.2.Z:python-idna-0:3.7-6.el10_2.src", "BaseOS-10.2.Z:python3-idna-0:3.7-6.el10_2.noarch" ]
    } ],
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        "attackComplexity" : "LOW",
        "attackVector" : "NETWORK",
        "availabilityImpact" : "LOW",
        "baseScore" : 5.3,
        "baseSeverity" : "MEDIUM",
        "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:L",
        "version" : "3.1"
      },
      "products" : [ "BaseOS-10.2.Z:python-idna-0:3.7-6.el10_2.src", "BaseOS-10.2.Z:python3-idna-0:3.7-6.el10_2.noarch" ]
    } ],
    "threats" : [ {
      "category" : "impact",
      "details" : "Moderate"
    } ],
    "title" : "python-idna: idna: Denial of Service via specially crafted long inputs"
  } ]
}