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OpenAdvisories
High ALAS2023-2026-1801 1 CVE

Important: rsync security update (Amazon Linux 2023)

Published Jun 8, 2026 · Updated Jun 8, 2026

Summary

Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-43618: 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.

Fixed packages 4

ReleasePackageFixed in
Amazon Linux · 2023 rsync 0:3.4.0-1.amzn2023.0.4
Amazon Linux · 2023 rsync-daemon 0:3.4.0-1.amzn2023.0.4
Amazon Linux · 2023 rsync-debuginfo 0:3.4.0-1.amzn2023.0.4
Amazon Linux · 2023 rsync-debugsource 0:3.4.0-1.amzn2023.0.4

Vulnerabilities 1

  • High 8.1

    Rsync < 3.4.3 Integer Overflow Information Disclosure

    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 …

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-43618.html