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CVE-2026-43618

CVE-2026-43618 · Rsync < 3.4.3 Integer Overflow Information Disclosure

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

Rsync version 3.4.2 and prior contain an integer overflow vulnerability in the compressed-token decoder where a 32-bit signed counter is not checked for overflow, allowing a malicious sender to trigger an overflow that causes the receiver process to read and return data from outside the intended buffer bounds. Attackers can exploit this vulnerability to disclose process memory contents including environment variables, passwords, heap and stack data, and library memory pointers, significantly reducing ASLR effectiveness and facilitating further exploitation.

CVSS 6.1 · Medium · EPSS 0.8% · 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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