Vulnerability · Published May 20, 2026 · Assigned by VulnCheck
CVE-2026-43619Rsync < 3.4.3 Symlink Race Condition via Path-Based Syscalls
Medium 6.3
In plain English
A medium-severity security flaw in rsync from RsyncProject. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Rsync version 3.4.2 and prior contain symlink race condition vulnerabilities in path-based system calls including chmod, lchown, utimes, rename, unlink, mkdir, symlink, mknod, link, rmdir, and lstat that allow local attackers to redirect operations to files outside the exported rsync module. Attackers with local filesystem access can exploit the timing window between path resolution and syscall execution by swapping symlinks to apply sender-supplied permissions, ownership, timestamps, or filenames to arbitrary files outside the intended module boundary on rsync daemons configured with 'use chroot = no'.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | rsync | 3.4.3-r0 | ALPINE-CVE-2026-43619 |
| Alpine:v3.21 | rsync | 3.4.3-r0 | ALPINE-CVE-2026-43619 |
| Alpine:v3.22 | rsync | 3.4.3-r0 | ALPINE-CVE-2026-43619 |
| Alpine:v3.23 | rsync | 3.4.3-r0 | ALPINE-CVE-2026-43619 |
| Alpine:v3.24 | rsync | 3.4.3-r0 | ALPINE-CVE-2026-43619 |
| Debian:12 | rsync | 3.2.7-1+deb12u5 | DEBIAN-CVE-2026-43619 |
| Debian:13 | rsync | 3.4.1+ds1-5+deb13u3 | DEBIAN-CVE-2026-43619 |
| Debian:14 | rsync | 3.4.3+ds1-1 | DEBIAN-CVE-2026-43619 |
| Ubuntu:22.04:LTS | rsync | 3.2.7-0ubuntu0.22.04.6 | UBUNTU-CVE-2026-43619 |
| Ubuntu:24.04:LTS | rsync | 3.2.7-1ubuntu1.4 | UBUNTU-CVE-2026-43619 |
| Ubuntu:25.10 | rsync | 3.4.1+ds1-5ubuntu1.2 | UBUNTU-CVE-2026-43619 |
| Ubuntu:26.04:LTS | rsync | 3.4.1+ds1-7ubuntu0.2 | UBUNTU-CVE-2026-43619 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| RsyncProject | rsync | 0 – before 3.4.3 |
Weakness: CWE-367, CWE-59 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N