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      "text" : "An update for unbound is now available for Red Hat Enterprise Linux 8.\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.",
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      "text" : "The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver. \n\nSecurity Fix(es):\n\n* unbound: Heap overflow and crash with multiple nsid, cookie, padding EDNS options (CVE-2026-42944)\n\n* unbound: Unbound DNSSEC Validator Denial of Service via Incorrect Write Offset Counter in Chase-Reply Messages (CVE-2026-42959)\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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      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "unbound: Heap overflow and crash with multiple nsid, cookie, padding EDNS options",
      "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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        "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",
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      "details" : "Important"
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    "title" : "unbound: Heap overflow and crash with multiple nsid, cookie, padding EDNS options"
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    "acknowledgments" : [ {
      "names" : [ "Qifan Zhang" ],
      "organization" : "Palo Alto"
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    "cve" : "CVE-2026-42959",
    "cwe" : {
      "id" : "CWE-824",
      "name" : "Access of Uninitialized Pointer"
    },
    "discovery_date" : "2026-05-19T11:23:24.234000+00:00",
    "ids" : [ {
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      "text" : "2479806"
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      "category" : "description",
      "text" : "A flaw was found in Unbound's DNSSEC validator when constructing chase-reply messages for validation. The code uses the wrong counter to calculate write offsets for ADDITIONAL section resource record sets. When a DNAME chain is combined with authority filtering, an uninitialized array slot is created that the validator later dereferences, causing an immediate process crash. Any application or infrastructure relying on Unbound for DNS resolution could be forced to exit unexpectedly, resulting in a denial-of-service condition.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "unbound: Unbound DNSSEC Validator Denial of Service via Incorrect Write Offset Counter in Chase-Reply Messages",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "The Red Hat Product Security team has assessed the severity of this vulnerability as Important, given that it can be remotely triggered without authentication or user interaction via a single crafted DNS query. Successful exploitation allows an attacker to crash the Unbound resolver process, disrupting DNS resolution for all dependent services. The vulnerability's root cause is the use of incorrect counters to calculate write offsets, leading to dereference of an uninitialized pointer and subsequent denial-of-service.",
      "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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      "url" : "https://access.redhat.com/security/cve/CVE-2026-42959"
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      "category" : "external",
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      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2479806"
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      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-42959",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-42959"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-42959",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-42959"
    } ],
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      "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" : "unbound: Unbound DNSSEC Validator Denial of Service via Incorrect Write Offset Counter in Chase-Reply Messages"
  } ]
}