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CVE-2026-43620

CVE-2026-43620 · Rsync < 3.4.3 Out-of-Bounds Array Read via recv_files()

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

Rsync version 3.4.2 and prior contain a receiver-side out-of-bounds array read vulnerability in recv_files() in receiver.c that allows a malicious rsync server to crash the rsync client process. Attackers can exploit the vulnerability by setting CF_INC_RECURSE in compatibility flags and sending a specially crafted file list where the first sorted entry is not the leading dot directory, followed by a transfer record with ndx=0 and an iflag word without ITEM_TRANSFER, causing the receiver to read 8 bytes before the allocated pointer array and dereference an invalid pointer at an unmapped address, resulting in a deterministic SIGSEGV crash of the rsync client.

CVSS 6.9 · Medium · EPSS 0.4% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • rsync

    Versions
    • ≥ 0, < 3.4.3: Affected (semver)

    Update to 3.4.3

  • 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
    Affected ranges
    • ECOSYSTEM: < 3.2.7-1+deb12u5

    Update to 3.2.7-1+deb12u5

  • rsync Debian:13

    Versions
    • 3.4.1+ds1-5
    • 3.4.1+ds1-5+deb13u1
    • 3.4.1+ds1-5+deb13u2
    Affected ranges
    • ECOSYSTEM: < 3.4.1+ds1-5+deb13u3

    Update to 3.4.1+ds1-5+deb13u3

  • 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
    Affected ranges
    • ECOSYSTEM: < 3.4.3+ds1-1

    Update to 3.4.3+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
    Affected ranges
    • ECOSYSTEM: < 3.1.0-2ubuntu0.4+esm3

    Update to 3.1.0-2ubuntu0.4+esm3

  • 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
    Affected ranges
    • ECOSYSTEM: < 3.1.1-3ubuntu1.3+esm5

    Update to 3.1.1-3ubuntu1.3+esm5

  • 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
    Affected ranges
    • ECOSYSTEM: < 3.1.2-2.1ubuntu1.6+esm3

    Update to 3.1.2-2.1ubuntu1.6+esm3

  • 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
    Affected ranges
    • ECOSYSTEM: < 3.1.3-8ubuntu0.9+esm1

    Update to 3.1.3-8ubuntu0.9+esm1

  • 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
    Affected ranges
    • ECOSYSTEM: < 3.2.7-0ubuntu0.22.04.6

    Update to 3.2.7-0ubuntu0.22.04.6

  • 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
    Affected ranges
    • ECOSYSTEM: < 3.2.7-1ubuntu1.4

    Update to 3.2.7-1ubuntu1.4

  • rsync Ubuntu:25.10

    Versions
    • 3.4.1+ds1-3
    • 3.4.1+ds1-4
    • 3.4.1+ds1-5
    • 3.4.1+ds1-5ubuntu1
    Affected ranges
    • ECOSYSTEM: < 3.4.1+ds1-5ubuntu1.2

    Update to 3.4.1+ds1-5ubuntu1.2

  • rsync Ubuntu:26.04:LTS

    Versions
    • 3.4.1+ds1-5ubuntu1
    • 3.4.1+ds1-6
    • 3.4.1+ds1-7
    Affected ranges
    • ECOSYSTEM: < 3.4.1+ds1-7ubuntu0.2

    Update to 3.4.1+ds1-7ubuntu0.2

Original sources

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