{
  "cveId": "CVE-2026-43617",
  "url": "https://patchblox.com/security/cve/CVE-2026-43617",
  "summary": "CVE-2026-43617 is fixed in 4 products on 1 platform, first by rsync 3.1.2-2.1ubuntu1.6\u002Besm3, released May 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "Rsync \u003C 3.4.3 Authorization Bypass via Hostname Resolution",
  "description": "Rsync version\u00A03.4.2 and prior contain an authorization bypass vulnerability in the rsync daemon\u0027s 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.",
  "published": "2026-05-19T17:00:00Z",
  "severity": "Moderate",
  "cvss": 4.8,
  "cwe": "Authentication Bypass by Alternate Name",
  "epss": 0.00282,
  "epssPercentile": 0.20804,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43617",
  "fixes": [
    {
      "platform": "linux",
      "product": "rsync",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "3.2.7-1\u002Bdeb12u5",
      "fix": "DEBIAN-CVE-2026-43617",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-43617",
      "released": "2026-05-27T17:38:13Z"
    },
    {
      "platform": "linux",
      "product": "rsync",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "3.4.1\u002Bds1-5\u002Bdeb13u3",
      "fix": "DEBIAN-CVE-2026-43617",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-43617",
      "released": "2026-05-27T17:38:13Z"
    },
    {
      "platform": "linux",
      "product": "rsync",
      "release": "Debian 14",
      "fixedVersion": "3.4.3\u002Bds1-1",
      "fix": "DEBIAN-CVE-2026-43617",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-43617",
      "released": "2026-05-27T17:38:13Z"
    },
    {
      "platform": "linux",
      "product": "rsync",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "3.1.2-2.1ubuntu1.6\u002Besm3",
      "fix": "rsync 3.1.2-2.1ubuntu1.6\u002Besm3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-rsync-3.1.2-2.1ubuntu1.6-esm3",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "rsync",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "3.1.3-8ubuntu0.9\u002Besm1",
      "fix": "rsync 3.1.3-8ubuntu0.9\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-rsync-3.1.3-8ubuntu0.9-esm1",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "rsync",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "3.2.7-0ubuntu0.22.04.6",
      "fix": "rsync 3.2.7-0ubuntu0.22.04.6",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-rsync-3.2.7-0ubuntu0.22.04.6",
      "released": "2026-05-27T17:38:24Z"
    },
    {
      "platform": "linux",
      "product": "rsync",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "3.2.7-1ubuntu1.4",
      "fix": "rsync 3.2.7-1ubuntu1.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-rsync-3.2.7-1ubuntu1.4",
      "released": "2026-05-27T17:38:28Z"
    },
    {
      "platform": "linux",
      "product": "rsync",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "3.4.1\u002Bds1-5ubuntu1.2",
      "fix": "rsync 3.4.1\u002Bds1-5ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-rsync-3.4.1-ds1-5ubuntu1.2",
      "released": "2026-05-27T17:38:31Z"
    },
    {
      "platform": "linux",
      "product": "rsync",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "3.4.1\u002Bds1-7ubuntu0.2",
      "fix": "rsync 3.4.1\u002Bds1-7ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-rsync-3.4.1-ds1-7ubuntu0.2",
      "released": "2026-05-19T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "rsync",
      "release": "amzn 2023",
      "fixedVersion": "3.5.1-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3131",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3131",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "rsync",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "3.4.1-160000.6.1",
      "fix": "OPENSUSE-SU-2026:21650-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21650-1",
      "released": "2026-08-26T12:30:55Z"
    },
    {
      "platform": "linux",
      "product": "rsync",
      "release": "sles 16.0",
      "fixedVersion": "3.4.1-160000.6.1",
      "fix": "SUSE-SU-2026:23323-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23323-1",
      "released": "2026-08-26T12:30:35Z"
    },
    {
      "platform": "linux",
      "product": "rsync-daemon",
      "release": "amzn 2023",
      "fixedVersion": "3.5.1-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3131",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3131",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "rsync-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "3.5.1-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3131",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3131",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "rsync-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "3.5.1-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3131",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3131",
      "released": "2026-09-28T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}