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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 Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
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          "number": "1",
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        "name": "Inefficient Algorithmic Complexity"
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        {
          "category": "description",
          "text": "NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability when handling replies with very large RRsets that Unbound needs to perform name compression for. Malicious upstream responses with very large RRsets with records that don't share a suffix above the root can cause Unbound to spend a considerable time applying name compression to downstream replies. This can lead to degraded performance and eventually denial of service in well orchestrated attacks. An adversary can exploit the vulnerability by querying Unbound for the specially crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will try to apply name compression which was an unbounded operation that could lock the CPU until the whole packet was complete. A compression limit was introduced in 1.21.1 for this but it didn't account for the case where records would not share any suffix above the root. That causes Unbound to go in a different code path because of the compression tree lookup failure and eventually not increment the compression counter for those operations. Unbound 1.25.1 contains a patch with a fix that increments the compression counter regardless of the compression tree lookup. This is a complement fix to CVE-2024-8508.",
          "title": "Vulnerability description"
        },
        {
          "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://cve.tuxcare.com/els/cve/CVE-2026-44390"
        },
        {
          "category": "external",
          "summary": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-44390.txt",
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-44390.txt"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:24013",
          "url": "https://access.redhat.com/errata/RHSA-2026:24013"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:36320",
          "url": "https://access.redhat.com/errata/RHSA-2026:36320"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:36777",
          "url": "https://access.redhat.com/errata/RHSA-2026:36777"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:37282",
          "url": "https://access.redhat.com/errata/RHSA-2026:37282"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/security/cve/CVE-2026-44390",
          "url": "https://access.redhat.com/security/cve/CVE-2026-44390"
        },
        {
          "category": "external",
          "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2480130",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480130"
        },
        {
          "category": "external",
          "summary": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44390.json",
          "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44390.json"
        }
      ],
      "release_date": "2026-05-20T10:16:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-10-15T10:08:31.425644Z",
          "details": "CVE-2026-44390 is a CPU-exhaustion issue in Unbound’s name-compression path that only affects availability; it has no confidentiality or integrity impact and carries a medium CVSS (5.3) with low availability impact. Exploitation requires steering the resolver to attacker-controlled domains whose authoritative servers return intentionally huge, non-compressible RRsets, and sustained querying is needed to maintain any service degradation. In centrally managed enterprise deployments where recursive resolvers are not exposed as public services, this confines exposure to cases where an internal client is induced to repeatedly resolve such domains, making it reasonable to deprioritize relative to flaws enabling data access or code execution.",
          "product_ids": [
            "Oracle-Linux-6:unbound-0:1.4.20-29.el6_10.1.i686",
            "Oracle-Linux-6:unbound-0:1.4.20-29.el6_10.1.tuxcare.els2.i686",
            "Oracle-Linux-6:unbound-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64",
            "Oracle-Linux-6:unbound-0:1.4.20-29.el6_10.1.x86_64",
            "Oracle-Linux-6:unbound-devel-0:1.4.20-29.el6_10.1.i686",
            "Oracle-Linux-6:unbound-devel-0:1.4.20-29.el6_10.1.tuxcare.els2.i686",
            "Oracle-Linux-6:unbound-devel-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64",
            "Oracle-Linux-6:unbound-devel-0:1.4.20-29.el6_10.1.x86_64",
            "Oracle-Linux-6:unbound-libs-0:1.4.20-29.el6_10.1.i686",
            "Oracle-Linux-6:unbound-libs-0:1.4.20-29.el6_10.1.tuxcare.els2.i686",
            "Oracle-Linux-6:unbound-libs-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64",
            "Oracle-Linux-6:unbound-libs-0:1.4.20-29.el6_10.1.x86_64",
            "Oracle-Linux-6:unbound-python-0:1.4.20-29.el6_10.1.i686",
            "Oracle-Linux-6:unbound-python-0:1.4.20-29.el6_10.1.tuxcare.els2.i686",
            "Oracle-Linux-6:unbound-python-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64",
            "Oracle-Linux-6:unbound-python-0:1.4.20-29.el6_10.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "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": [
            "Oracle-Linux-6:unbound-0:1.4.20-29.el6_10.1.i686",
            "Oracle-Linux-6:unbound-0:1.4.20-29.el6_10.1.tuxcare.els2.i686",
            "Oracle-Linux-6:unbound-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64",
            "Oracle-Linux-6:unbound-0:1.4.20-29.el6_10.1.x86_64",
            "Oracle-Linux-6:unbound-devel-0:1.4.20-29.el6_10.1.i686",
            "Oracle-Linux-6:unbound-devel-0:1.4.20-29.el6_10.1.tuxcare.els2.i686",
            "Oracle-Linux-6:unbound-devel-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64",
            "Oracle-Linux-6:unbound-devel-0:1.4.20-29.el6_10.1.x86_64",
            "Oracle-Linux-6:unbound-libs-0:1.4.20-29.el6_10.1.i686",
            "Oracle-Linux-6:unbound-libs-0:1.4.20-29.el6_10.1.tuxcare.els2.i686",
            "Oracle-Linux-6:unbound-libs-0:1.4.20-29.el6_10.1.tuxcare.els2.x86_64",
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ]
    }
  ]
}