{
  "document": {
    "aggregate_severity": {
      "text": "Medium"
    },
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "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"
      }
    ],
    "publisher": {
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      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
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        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/debian11els/vex/2026/cve-2026-43617-els_os-debian11els.json"
      }
    ],
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      "current_release_date": "2026-09-18T13:36:39Z",
      "generator": {
        "date": "2026-09-18T13:36:39Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CVE-2026-43617-ELS_OS-DEBIAN11ELS",
      "initial_release_date": "2026-05-20T02:16:00Z",
      "revision_history": [
        {
          "date": "2026-05-20T02:16:00Z",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-09-17T12:45:34Z",
          "number": "2",
          "summary": "Official Publication"
        },
        {
          "date": "2026-09-18T13:36:39Z",
          "number": "3",
          "summary": "Update document"
        }
      ],
      "status": "final",
      "version": "3"
    },
    "title": "Security update on CVE-2026-43617"
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  "vulnerabilities": [
    {
      "cve": "CVE-2026-43617",
      "cwe": {
        "id": "CWE-289",
        "name": "Authentication Bypass by Alternate Name"
      },
      "notes": [
        {
          "category": "description",
          "text": "Rsync version 3.4.2 and prior contain an authorization bypass vulnerability in the rsync daemon's hostname-based access control list enforcement when configured with chroot. Attackers can bypass hostname-based deny rules by controlling the PTR record for their source IP address, allowing connections from hostnames that administrators intended to deny when reverse DNS resolution fails and defaults to UNKNOWN.",
          "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"
        }
      ],
      "product_status": {
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          "Debian-11:rsync-0:3.2.3-4+deb11u4+tuxcare.els3.arm64",
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          "Debian-11:rsync-0:3.2.3-4+deb11u4+tuxcare.els4.arm64",
          "Debian-11:rsync-0:3.2.3-4+deb11u4+tuxcare.els4.armel",
          "Debian-11:rsync-0:3.2.3-4+deb11u4.amd64",
          "Debian-11:rsync-0:3.2.3-4+deb11u4.arm64",
          "Debian-11:rsync-0:3.2.3-4+deb11u4.armel"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-43617"
        },
        {
          "category": "external",
          "summary": "https://github.com/RsyncProject/rsync/releases/tag/v3.4.3",
          "url": "https://github.com/RsyncProject/rsync/releases/tag/v3.4.3"
        },
        {
          "category": "external",
          "summary": "https://github.com/RsyncProject/rsync/security/advisories/GHSA-rjfm-3w2m-jf4f",
          "url": "https://github.com/RsyncProject/rsync/security/advisories/GHSA-rjfm-3w2m-jf4f"
        },
        {
          "category": "external",
          "summary": "https://www.vulncheck.com/advisories/rsync-authorization-bypass-via-hostname-resolution",
          "url": "https://www.vulncheck.com/advisories/rsync-authorization-bypass-via-hostname-resolution"
        }
      ],
      "release_date": "2026-05-20T02:16:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-09-03T15:15:56.980596Z",
          "details": "This issue only applies when rsync is run in daemon mode with hostname-based ACLs inside a chroot whose tree lacks resolver/NSS files; deployments using rsync over SSH or IP/netmask ACLs are not affected. Exploitation requires network reachability and manipulation of reverse-DNS behavior (e.g., attacker-controlled PTR or a lookup failure inside the chroot), and the scored impact is limited (low confidentiality/integrity, no availability) with high attack complexity. Given these narrow preconditions and the constrained practical blast radius in centrally managed VM/server environments, this CVE can be safely deprioritized.",
          "product_ids": [
            "Debian-11:rsync-0:3.2.3-4+deb11u4+tuxcare.els3.amd64",
            "Debian-11:rsync-0:3.2.3-4+deb11u4+tuxcare.els3.arm64",
            "Debian-11:rsync-0:3.2.3-4+deb11u4+tuxcare.els3.armel",
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            "Debian-11:rsync-0:3.2.3-4+deb11u4+tuxcare.els4.arm64",
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            "Debian-11:rsync-0:3.2.3-4+deb11u4.armel"
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
          "products": [
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            "Debian-11:rsync-0:3.2.3-4+deb11u4+tuxcare.els4.arm64",
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ]
    }
  ]
}