[USN-8283-1] rsync vulnerabilities

========================================================================== Ubuntu Security Notice USN-8283-1 May 20, 2026 rsync vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 26.04 LTS - Ubuntu 25.10 - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS Summary: Several security issues were fixed in rsync. Software Description: - rsync: fast, versatile, remote (and local) file-copying tool Details: Calum Hutton discovered that rsync contained a heap-based out-of-bounds read when handling file transfers. A remote attacker with read access to an rsync server could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 25.10. (CVE-2025-10158) Batuhan Sancak, Damien Neil, and Michael Stapelberg discovered that rsync daemons configured without chroot protection were exposed to a race condition on parent path components. A local attacker with write access to a module could possibly use this issue to overwrite files, obtain sensitive information, or escalate privileges. (CVE-2026-29518) It was discovered that rsync did not properly validate a length value while sorting extended attributes. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-41035) It was discovered that rsync performed reverse-DNS lookups after chrooting in some daemon configurations. A remote attacker could possibly use this issue to bypass hostname-based access controls and access network services. (CVE-2026-43617) Omar Elsayed discovered that rsync did not properly check for integer overflows while decoding compressed tokens. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-43618) Andrew Tridgell discovered that rsync did not fully fix a symlink race condition in path-based system calls for daemons configured without chroot protection. A local attacker could possibly use this issue to overwrite files, obtain sensitive information, or escalate privileges. (CVE-2026-43619) Pratham Gupta discovered that rsync did not properly validate an index while processing file lists. A remote attacker could possibly use this issue to cause rsync to crash, resulting in a denial of service. (CVE-2026-43620) Michal Ruprich discovered that rsync contained an off-by-one error while handling HTTP proxy responses. An attacker able to intercept network communications or a malicious proxy server could possibly use this issue to cause a denial of service. (CVE-2026-45232) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS rsync 3.4.1+ds1-7ubuntu0.2 Ubuntu 25.10 rsync 3.4.1+ds1-5ubuntu1.2 Ubuntu 24.04 LTS rsync 3.2.7-1ubuntu1.4 Ubuntu 22.04 LTS rsync 3.2.7-0ubuntu0.22.04.6 In general, a standard system update will make all the necessary changes. After a standard system update you need to restart rsync daemons if configured to make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8283-1 CVE-2025-10158, CVE-2026-29518, CVE-2026-41035, CVE-2026-43617, CVE-2026-43618, CVE-2026-43619, CVE-2026-43620, CVE-2026-45232 Package Information: https://launchpad.net/ubuntu/+source/rsync/3.4.1+ds1-7ubuntu0.2 https://launchpad.net/ubuntu/+source/rsync/3.4.1+ds1-5ubuntu1.2 https://launchpad.net/ubuntu/+source/rsync/3.2.7-1ubuntu1.4 https://launchpad.net/ubuntu/+source/rsync/3.2.7-0ubuntu0.22.04.6