Ubuntu USN · USN-8349-1

rsync vulnerabilities

Published: Mon, 01 Jun 2026 09:20

CVE-2026-43618CVE-2025-10158CVE-2026-41035CVE-2026-43617CVE-2026-43620CVE-2026-43619CVE-2026-29518CVE-2026-45232

Summary

Several security issues were fixed in rsync.

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. (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)

Recommended actions per Ubuntu release

StackPatch playbook auto-generated per release codename and per affected package.

Ubuntu bionic

rsync→3.1.2-2.1ubuntu1.6+esm3apt_upgrade
Standard apt upgrade. Install 3.1.2-2.1ubuntu1.6+esm3 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y rsync
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
rsync→3.1.2-2.1ubuntu1.6+esm3apt_upgrade
Standard apt upgrade. Install 3.1.2-2.1ubuntu1.6+esm3 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y rsync
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu focal

rsync→3.1.3-8ubuntu0.9+esm1apt_upgrade
Standard apt upgrade. Install 3.1.3-8ubuntu0.9+esm1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y rsync
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
rsync→3.1.3-8ubuntu0.9+esm1apt_upgrade
Standard apt upgrade. Install 3.1.3-8ubuntu0.9+esm1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y rsync
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu trusty

rsync→3.1.0-2ubuntu0.4+esm3apt_upgrade
Standard apt upgrade. Install 3.1.0-2ubuntu0.4+esm3 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y rsync
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
rsync→3.1.0-2ubuntu0.4+esm3apt_upgrade
Standard apt upgrade. Install 3.1.0-2ubuntu0.4+esm3 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y rsync
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu xenial

rsync→3.1.1-3ubuntu1.3+esm5apt_upgrade
Standard apt upgrade. Install 3.1.1-3ubuntu1.3+esm5 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y rsync
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
rsync→3.1.1-3ubuntu1.3+esm5apt_upgrade
Standard apt upgrade. Install 3.1.1-3ubuntu1.3+esm5 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y rsync
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

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