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DEBIAN-CVE-2026-43617

Type: advisorySource: OSV1 source record

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.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-43617

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-43617

rsync

Source reference: /affected/0/package/name

Affected versions
3.2.7-1

Source reference: /affected/0/versions

3.2.7-1+deb12u1

Source reference: /affected/0/versions

3.2.7-1+deb12u2

Source reference: /affected/0/versions

3.2.7-1+deb12u3

Source reference: /affected/0/versions

3.2.7-1+deb12u4

Source reference: /affected/0/versions

Fixed versions
3.2.7-1+deb12u5

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

rsync

Source reference: /affected/1/package/name

Affected versions
3.4.1+ds1-5

Source reference: /affected/1/versions

3.4.1+ds1-5+deb13u1

Source reference: /affected/1/versions

3.4.1+ds1-5+deb13u2

Source reference: /affected/1/versions

Fixed versions
3.4.1+ds1-5+deb13u3

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

rsync

Source reference: /affected/2/package/name

Affected versions
3.4.1+ds1-5

Source reference: /affected/2/versions

3.4.1+ds1-6

Source reference: /affected/2/versions

3.4.1+ds1-7

Source reference: /affected/2/versions

3.4.1+ds1-8~exp1

Source reference: /affected/2/versions

3.4.2+ds1-1

Source reference: /affected/2/versions

3.4.2+ds1-2

Source reference: /affected/2/versions

Fixed versions
3.4.3+ds1-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.2.7-1+deb12u5"
          }
        ]
      }
    ],
    "package": {
      "name": "rsync",
      "purl": "pkg:deb/debian/rsync?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "3.2.7-1",
      "3.2.7-1+deb12u1",
      "3.2.7-1+deb12u2",
      "3.2.7-1+deb12u3",
      "3.2.7-1+deb12u4"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43617.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.4.1+ds1-5+deb13u3"
          }
        ]
      }
    ],
    "package": {
      "name": "rsync",
      "purl": "pkg:deb/debian/rsync?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "3.4.1+ds1-5",
      "3.4.1+ds1-5+deb13u1",
      "3.4.1+ds1-5+deb13u2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43617.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.4.3+ds1-1"
          }
        ]
      }
    ],
    "package": {
      "name": "rsync",
      "purl": "pkg:deb/debian/rsync?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "3.4.1+ds1-5",
      "3.4.1+ds1-6",
      "3.4.1+ds1-7",
      "3.4.1+ds1-8~exp1",
      "3.4.2+ds1-1",
      "3.4.2+ds1-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43617.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#57684 · Revision 1
Added to Heist Feed
Publisher date
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