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CVE-2026-53791

CVE-2026-53791 · rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header

This page contains facts from public vulnerability sources. Check the original advisory before updating.

rsync daemon before 3.5.0 contains an IP address spoofing vulnerability that allows unauthenticated remote attackers to bypass IP-based access controls by sending a crafted PROXY protocol header with a forged source address. Attackers who can connect directly to the rsync daemon can inject a spoofed source IP in the PROXY protocol header to circumvent hosts allow/deny rules, gaining unauthorized access that would otherwise be blocked based on their real source address.

CVSS 9.1 · Critical · EPSS 0.5% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • rsync

    Versions
    • ≥ 0, ≤ 3.4.4: Affected (semver)
    • 3.5.0: Not affected (semver)

    Update to 3.5.0

  • rsync 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
    • 3.2.7-1+deb12u5
    • 3.2.7-1+deb12u6
    • 3.3.0+ds1-1
    • 3.3.0+ds1-2
    • 3.3.0+ds1-3
    • 3.3.0+ds1-4
    • 3.3.0-1
    • 3.4.1+ds1-1
    • 3.4.1+ds1-2
    • 3.4.1+ds1-3
    • 3.4.1+ds1-4
    • 3.4.1+ds1-4~exp1
    • 3.4.1+ds1-4~exp2
    • 3.4.1+ds1-5
    • 3.4.1+ds1-5~exp1
    • 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
    • 3.4.3+ds1-1
    • 3.4.3+ds1-2
    • 3.4.4+ds1-1
    • 3.5.0+ds1-1
    • 3.5.0+ds1-2
    • 3.5.0+ds1-3
    • 3.5.1+ds1-1
    • 3.5.1+ds1-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rsync Debian:13

    Versions
    • 3.4.1+ds1-5
    • 3.4.1+ds1-5+deb13u1
    • 3.4.1+ds1-5+deb13u2
    • 3.4.1+ds1-5+deb13u3
    • 3.4.1+ds1-5+deb13u4
    • 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
    • 3.4.3+ds1-1
    • 3.4.3+ds1-2
    • 3.4.4+ds1-1
    Affected ranges
    • ECOSYSTEM: < 3.5.0+ds1-0+deb13u1

    Update to 3.5.0+ds1-0+deb13u1

  • rsync 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
    • 3.4.3+ds1-1
    • 3.4.3+ds1-2
    • 3.4.4+ds1-1
    Affected ranges
    • ECOSYSTEM: < 3.5.0+ds1-1

    Update to 3.5.0+ds1-1

  • rsync Ubuntu:Pro:14.04:LTS

    Versions
    • 3.0.9-4ubuntu1
    • 3.1.0-2
    • 3.1.0-2ubuntu0.1
    • 3.1.0-2ubuntu0.2
    • 3.1.0-2ubuntu0.3
    • 3.1.0-2ubuntu0.4
    • 3.1.0-2ubuntu0.4+esm1
    • 3.1.0-2ubuntu0.4+esm2
    • 3.1.0-2ubuntu0.4+esm3
    • 3.1.0-2ubuntu0.4+esm4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rsync Ubuntu:Pro:16.04:LTS

    Versions
    • 3.1.1-3
    • 3.1.1-3ubuntu1
    • 3.1.1-3ubuntu1.1
    • 3.1.1-3ubuntu1.2
    • 3.1.1-3ubuntu1.3
    • 3.1.1-3ubuntu1.3+esm1
    • 3.1.1-3ubuntu1.3+esm2
    • 3.1.1-3ubuntu1.3+esm3
    • 3.1.1-3ubuntu1.3+esm4
    • 3.1.1-3ubuntu1.3+esm5
    • 3.1.1-3ubuntu1.3+esm6
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rsync Ubuntu:Pro:18.04:LTS

    Versions
    • 3.1.2-2
    • 3.1.2-2.1
    • 3.1.2-2.1ubuntu1
    • 3.1.2-2.1ubuntu1.1
    • 3.1.2-2.1ubuntu1.2
    • 3.1.2-2.1ubuntu1.3
    • 3.1.2-2.1ubuntu1.4
    • 3.1.2-2.1ubuntu1.5
    • 3.1.2-2.1ubuntu1.6
    • 3.1.2-2.1ubuntu1.6+esm1
    • 3.1.2-2.1ubuntu1.6+esm2
    • 3.1.2-2.1ubuntu1.6+esm3
    • 3.1.2-2.1ubuntu1.6+esm4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rsync Ubuntu:Pro:20.04:LTS

    Versions
    • 3.1.3-6
    • 3.1.3-8
    • 3.1.3-8ubuntu0.1
    • 3.1.3-8ubuntu0.2
    • 3.1.3-8ubuntu0.3
    • 3.1.3-8ubuntu0.4
    • 3.1.3-8ubuntu0.5
    • 3.1.3-8ubuntu0.7
    • 3.1.3-8ubuntu0.8
    • 3.1.3-8ubuntu0.9
    • 3.1.3-8ubuntu0.9+esm1
    • 3.1.3-8ubuntu0.9+esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rsync Ubuntu:22.04:LTS

    Versions
    • 3.2.3-4ubuntu1
    • 3.2.3-4ubuntu2
    • 3.2.3-8ubuntu1
    • 3.2.3-8ubuntu2
    • 3.2.3-8ubuntu3
    • 3.2.3-8ubuntu3.1
    • 3.2.7-0ubuntu0.22.04.2
    • 3.2.7-0ubuntu0.22.04.3
    • 3.2.7-0ubuntu0.22.04.4
    • 3.2.7-0ubuntu0.22.04.6
    • 3.2.7-0ubuntu0.22.04.7
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rsync Ubuntu:24.04:LTS

    Versions
    • 3.2.7-1
    • 3.2.7-1build1
    • 3.2.7-1build2
    • 3.2.7-1ubuntu1
    • 3.2.7-1ubuntu1.1
    • 3.2.7-1ubuntu1.2
    • 3.2.7-1ubuntu1.4
    • 3.2.7-1ubuntu1.5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rsync Ubuntu:26.10

    Versions
    • 3.4.1+ds1-7
    • 3.4.4+ds1-1
    • 3.4.4+ds1-1build1
    • 3.5.0+ds1-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rsync Ubuntu:26.04:LTS

    Versions
    • 3.4.1+ds1-5ubuntu1
    • 3.4.1+ds1-6
    • 3.4.1+ds1-7
    • 3.4.1+ds1-7ubuntu0.2
    • 3.4.1+ds1-7ubuntu0.3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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